Talk:Climate change
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Frequently asked questions To view an answer, click the [show] link to the right of the question. To view references used by an answer, you must also click the [show] for references at the bottom of the FAQ. Q1: Is there really a scientific consensus on climate change?
A1: Yes. The IPCC findings of recent warming as a result of human influence are explicitly recognized as the "consensus" scientific view by the science academies of all the major industrialized countries. No scientific body of national or international standing presently rejects the basic findings of human influence on recent climate. This scientific consensus is supported by over 99% of publishing climate scientists.[1]
Q2: How can we say climate change is real when it's been so cold in such-and-such a place?
A2: This is why it is termed "global warming", not "(such-and-such a place) warming". Even then, what rises is the average temperature over time – that is, the temperature will fluctuate up and down within the overall rising trend. To give an idea of the relevant time scales, the standard averaging period specified by the World Meteorological Organisation (WMO) is 30 years. Accordingly, the WMO defines climate change as "a statistically significant variation in either the mean state of the climate or in its variability, persisting for an extended period (typically decades or longer)."[2] Q3: Can't the increase of CO2 be from natural sources, like volcanoes or the oceans?
A3: While these claims are popular among global warming skeptics,[3][4] including academically trained ones,[5][6] they are incorrect. This is known from any of several perspectives:
Q4: I think the article is missing some things, or has some things wrong. Can I change it?
A4: Yes. Keep in mind that your points need to be based on documented evidence from the peer-reviewed literature, or other information that meets standards of verifiability, reliability, and no original research. If you do not have such evidence, more experienced editors may be able to help you find it (or confirm that such evidence does not exist). You are welcome to make such queries on the article's talk page but please keep in mind that the talk page is for discussing improvements to the article, not discussing the topic. There are many forums that welcome general discussions of global warming, but the article talk page is not such a forum. Q5: Why haven't the graphs been updated?
A5: Two reasons:
Q6: Isn't climate change "just a theory"?
A6: People who say this are abusing the word "theory" by conflating its common meaning with its scientific meaning.
In common usage, "theory" can mean a hunch or guess, but a scientific theory, roughly speaking, means a coherent set of explanations that is compatible with observations and that allows predictions to be made. That the temperature is rising is an observation. An explanation for this (also known as a hypothesis) is that the warming is primarily driven by greenhouse gases (such as CO2 and methane) released into the atmosphere by human activity. Scientific models have been built that predict the rise in temperature and these predictions have matched observations. When scientists gain confidence in a hypothesis because it matches observation and has survived intense scrutiny, the hypothesis may be called a "theory". Strictly speaking, scientific theories are never proven, but the degree of confidence in a theory can be discussed. The scientific models now suggest that it is "extremely likely" (>95%) to "virtually certain" (>99%) that the increases in temperature have been caused by human activity as discussed in the IPCC Fifth Assessment Report. Global warming via greenhouse gases by human activity is a theory (in the scientific sense), but it is most definitely not just a hunch or guess. Q7: Does methane cause more warming than CO2?
A7: It's true that methane is more potent molecule for molecule. But there's far less of it in the atmosphere, so the total effect is smaller. The atmospheric lifetime of methane (about 10 years) is a lot shorter than that of CO2 (hundreds to thousands of years), so when methane emissions are reduced the concentration in the atmosphere soon falls, whereas CO2 accumulates in the atmosphere over long periods. For details see the greenhouse gas and global warming potential articles.
Q8: How can you say there's a consensus when lists of "skeptical scientists" have been compiled?
A8: Consensus is not the same as unanimity, the latter of which is impractical for large groups. Over 99% of publishing climate scientists agree on anthropogenic climate change.[1] This is an extremely high percentage well past any reasonable threshold for consensus. Any list of "skeptical scientists" would be dwarfed by a comparably compiled list of scientists accepting anthropogenic climate change. Q9: Did climate change end in 1998?
A9: One of the strongest El Niño events in the instrumental record occurred during late 1997 through 1998, causing a spike in global temperature for 1998. Through the mid-late 2000s this abnormally warm year could be chosen as the starting point for comparisons with later years in order to produce a cooling trend; choosing any other year in the 20th century produced a warming trend. This no longer holds since the mean global temperatures in 2005, 2010, 2014, 2015 and 2016 have all been warmer than 1998.[12]
More importantly, scientists do not define a "trend" by looking at the difference between two given years. Instead they use methods such as linear regression that take into account all the values in a series of data. The World Meteorological Organisation specifies 30 years as the standard averaging period for climate statistics so that year-to-year fluctuations are averaged out;[2] thus, 10 years isn't long enough to detect a climate trend. Q10: Wasn't Greenland much warmer during the period of Norse settlement?
A10: Some people assume this because of the island's name. In fact the Saga of Erik the Red tells us Erik named the new colony Greenland because "men will desire much the more to go there if the land has a good name."[13] Advertising hype was alive and well in 985 AD.
While much of Greenland was and remains under a large ice sheet, the areas of Greenland that were settled by the Norse were coastal areas with fjords that, to this day, remain quite green. You can see the following images for reference:
Q11: Are the IPCC reports prepared by biased UN scientists?
A11: The IPCC reports are not produced by "UN scientists". The IPCC does not employ the scientists who generate the reports, and it has no control over them. The scientists are internationally recognized experts, most with a long history of successful research in the field. They are employed by various organizations including scientific research institutes, agencies like NASA and NOAA, and universities. They receive no extra pay for their participation in the IPCC process, which is considered a normal part of their academic duties. Q12: Hasn't global sea ice increased over the last 30 years?
A12: Measurements show that it has not.[14] Claims that global sea ice amounts have stayed the same or increased are a result of cherry picking two data points to compare, while ignoring the real (strongly statistically significant) downward trend in measurements of global sea ice amounts.
Arctic sea ice cover is declining strongly; Antarctic sea ice cover has had some much smaller increases, though it may or may not be thinning, and the Southern Ocean is warming. The net global ice-cover trend is clearly downwards. Q13: Weren't scientists telling us in the 1970s that the Earth was cooling instead of warming?
A13: They weren't – see the article on global cooling. An article in the Bulletin of the American Meteorological Society has reviewed the scientific literature at that time and found that even during the 1970s the prevailing scientific concern was over warming.[15] The common misperception that cooling was the main concern during the 1970s arose from a few studies that were sensationalized in the popular press, such as a short nine-paragraph article that appeared in Newsweek in 1975.[16] (Newsweek eventually apologized for having misrepresented the state of the science in the 1970s.)[17] The author of that article has repudiated the idea that it should be used to deny global warming.[18] Q14: Doesn't water vapour cause 98% of the greenhouse effect?
A14: Water vapour is indeed a major greenhouse gas, contributing about 36% to 70% (not 98%) of the total greenhouse effect. But water vapour has a very short atmospheric lifetime (about 10 days), compared with decades to centuries for greenhouse gases like CO2 or nitrous oxide. As a result it is very nearly in a dynamic equilibrium in the atmosphere, which globally maintains a nearly constant relative humidity. In simpler terms, any excess water vapour is removed by rainfall, and any deficit of water vapour is replenished by evaporation from the Earth's surface, which literally has oceans of water. Thus water vapour cannot act as a driver of climate change.
Rising temperatures caused by the long-lived greenhouse gases will however allow the atmosphere to hold more vapour. This will lead to an increase in the absolute amount of water vapour in the atmosphere. Since water vapour is itself a greenhouse gas, this is an example of a positive feedback. Thus, whereas water vapour is not a driver of climate change, it amplifies existing trends. Q15: Is the fact that other solar system bodies are warming evidence for a common cause (i.e. the sun)?
A15: While some solar system bodies show evidence of local or global climate change, there is no evidence for a common cause of warming.
Q16: Do scientists support climate change just to get more money?
A16: No,
Q17: Doesn't the climate vary even without human activity?
A17: It does, but the fact that natural variation occurs does not mean that human-induced change cannot also occur. Climate scientists have extensively studied natural causes of climate change (such as orbital changes, volcanism, and solar variation) and have ruled them out as an explanation for the current temperature increase. Human activity is the cause at the 95 to 99 percent confidence level (see the IPCC Fifth Assessment Report for details). The high level of certainty in this is important to keep in mind to spot mention of natural variation functioning as a distraction. Q18: Should we include the view that climate change will lead to planetary doom or catastrophe?
A18: This page is about the science of climate change. It doesn't talk about planetary doom or catastrophe. For a technical explanation, see catastrophic climate change, and for paleoclimatic examples see PETM and great dying. Q19: Is an increase in global temperature of, say, 3 degrees Celsius (5.4 degrees Fahrenheit) important?
A19: Though it may not sound like much, a global temperature rise of 3 degrees Celsius (5.4 degrees Fahrenheit) is huge in climate terms. For example, the sea level rise it would produce would flood coastal cities around the world, which include most large cities.
Q20: Why are certain proposals to change the article discarded, deleted, or ignored? Who is/was Scibaby?
A20: Scibaby is/was a long term abusive sock-master (or coordinated group of sock masters) who has created 1,027 confirmed sock puppets, another 167 suspected socks, and probably many untagged or unrecognized ones. This page lists some recent creations. His modus operandi has changed over time, but includes proposing reasonably worded additions on the talk page that only on close examination turn out to be irrelevant, misinterpreted, or give undue weight to certain aspects. Scibaby is banned, and Scibaby socks are blocked as soon as they are identified. Some editors silently revert his additions, per WP:DENY, while others still assume good faith even for likely socks and engage them. Q21: What about this really interesting recent peer-reviewed paper I read or read about, that says...?
A21: There are hundreds of peer-reviewed papers published every month in respected scientific journals such as Geophysical Research Letters, the Journal of Climate, and others. We can't include all of them, but the article does include references to individual papers where there is consensus that they best represent the state of the relevant science. This is in accordance with the "due weight" principle (WP:WEIGHT) of the Neutral point of view policy and the "Wikipedia is not an indiscriminate collection of information" principle (WP:IINFO) of the What Wikipedia is not policy. Q22: Why does the article define "climate change" as a recent phenomenon? Hasn't the planet warmed and cooled before?
A22: Yes, the planet has warmed and cooled before. However, the term "climate change" without further qualification is widely understood to refer to the recent episode and often explicitly connected with the greenhouse effect. Per WP:COMMONNAME, we use the term in this most common meaning. The article Climate variability and change deals with the more general concept. Q23: Did the CERN CLOUD experiment prove that climate change is caused not by human activity but by cosmic rays?
A23: No. For cosmic rays to be causing global warming, all of the following would have to be true, whereas only the italicized one was tested in the 2011 experiment:[28]
Q24: I read that something can't fix climate change. Is this true?
A24: Yes, this is true for all plausible single things including: "electric cars", "planting trees", "low-carbon technology", "renewable energy", "Australia", "capitalism", "the doom & gloom approach", "a Ph.D. in thermodynamics". Note that it is problematic to use the word "fix" regarding climate change, as returning the climate to its pre-industrial state currently appears to be feasible only over a timeframe of thousands of years. Current efforts are instead aimed at mitigating (meaning limiting) climate change. Mitigation is strived for through the combination of many different things. See Climate change mitigation for details. References
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This article is written in British English, which has its own spelling conventions (colour, travelled, centre, defence, artefact, analyse) and some terms that are used in it may be different or absent from other varieties of English. According to the relevant style guide, this should not be changed without broad consensus. |
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On 3 August 2020, it was proposed that this article be moved from Global warming to Climate change. The result of the discussion was moved. |
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Carbon capture rates for CCS
[edit]Hi everyone. I have a few proposals regarding statements on carbon capture and storage in this article. Here's my first proposal. We have an unsourced sentence that says:
- Where energy production or CO2-intensive heavy industries continue to produce waste CO2, the gas can be captured and stored instead of released to the atmosphere.
I propose changing it to:
- Where energy production or CO2-intensive heavy industries continue to produce waste CO2, technology can sometimes be used to capture and store most of the gas instead of releasing it to the atmosphere.[1]
As explained in the World Resources Institute source, "today’s carbon capture systems do not capture 100% of emissions. Most are designed to capture 90%, but reported capture rates are lower in some cases." Additionally, it is not economically or geologically feasible to deploy CCS at all or even most facilities. There are 2,400 coal power plants in the world and thus far we have managed to add CCS to four of them. Clayoquot (talk | contribs) 21:41, 24 October 2024 (UTC)
- Done. Clayoquot (talk | contribs) 20:30, 30 October 2024 (UTC)
References
- ^ Lebling, Katie; Gangotra, Ankita; Hausker, Karl; Byrum, Zachary (2023-11-13). "7 Things to Know About Carbon Capture, Utilization and Sequestration". World Resources Institute.
Carbon sequestration section
[edit]The Carbon sequestration section has contents that describe carbon dioxide removal and carbon capture and storage. These three concepts are often confused. The vast majority of carbon sequestration happens through spontaneous, non-anthropogenic processes that have been going on for hundreds of millions of years and will continue if we just leave the forests alone. Most of the content in this section is about human activity that aims to increase the amount of carbon that is sequestered, i.e. carbon dioxide removal. There is also some content on carbon capture and storage, which technically involves sequestration but is usually deployed in processes that desequester more carbon than they sequester.
I propose 1) Retitling this section as "Carbon dioxide removal" and 2) Moving the two sentences on CCS to the end of the first paragraph in the "Clean energy" section. Clayoquot (talk | contribs) 20:11, 25 October 2024 (UTC)
- Done. Clayoquot (talk | contribs) 20:36, 30 October 2024 (UTC)
Paper about our work & suggestions
[edit]A paper by Olivia Steiert came out on the work we do here, analysing how our group dynamics and our interpretation of policies and guidelines resulted in the current article.
The paper analyses whether we consider climate change as an event (vs process), and if we call it a crisis. It's somewhat critical of us doing neither sufficiently clearly. The paper doesn't give that many pointers how we could achieve this however. We've made progress over the last 6 years in changing the article to be more about climate change now, rather than climate change in the future, but I wonder if there is more to do here. (changing the crisis framing is a discussion I won't reopen). If there are no objections, I might send Steiert an email asking her to join us. In the meantime, I'm suggesting two changes in the lead
The current rise in global average temperature is primarily caused by humans burning fossil fuels since the Industrial Revolution -->
Amplified warming in the Arctic has contributed to thawing permafrost, retreat of glaciers and sea ice decline --> something in the present tense. I'd suggest leaving out polar amplification too. The quote doesn't fully capture this sentence anyway, and the source doesn't make the connection between polar amplification and these specific impacts. —Femke 🐦 (talk) 19:44, 30 October 2024 (UTC)
- Thanks for sharing this, interesting article. The study uses the May 2022 version of this article, I wonder what she'd think of the current version.
- As for the sentence,
The current rise in...
, I believe we had added "since the Industrial Revolution" to clarify what is meant by current. Bogazicili (talk) 17:50, 31 October 2024 (UTC)- Upon reflection, I'd like to keep
since the Industrial Revolution
. One of the criticism in the article is that we are vague in terms of our tenses. When things happened, are happening, or will happen. (Why is it so hard to arrive at a clear understanding of when climate change is happening and why do temporal constructions of this event vary so broadly
) since the Industrial Revolution
gives precision and clarity to that sentence. I think it accurately describes rough timescale of human-induced climate change.- Other overview sources might say things like
The industrial activities that our modern civilization depends upon have raised atmospheric carbon dioxide levels by nearly 50% since 1750
[1] - If you click Industrial Revolution, it largely matches with above:
Beginning in Great Britain, the Industrial Revolution spread to continental Europe and the United States, from around 1760 to about 1820–1840.
Bogazicili (talk) 14:44, 1 November 2024 (UTC)- My thinking here is that "since the industrial revolution" may be a bit misleading, in the sense that most warming really happened in the last 50 years, rather than over such a long period of time. I'm also appreciating the simplicity of the POTD description below, and would like to move away from a WP:seaofblue in terms of number of links. —Femke 🐦 (talk) 17:13, 1 November 2024 (UTC)
- Upon reflection, I'd like to keep
That's a very good point, but I think we should add that (in the last 50 years part) into the lead, instead of removing "since the Industrial Revolution" part. I know you value conciseness but I think this time precision beats conciseness.
Again, the study was up to May 2022 version of this article. This is the 31 May 2022 version of the article. I think the current version of the lead is much more precise, as we define since when the current climate change has been happening. Industrial activities (NASA source) started with industrial revolution. Of course it was limited in 18th century. In 19th century it was few countries (UK etc), with coal etc. With technology (oil etc) and more countries industrializing, warming increased in 20th century, which is your point.
Also note that many cumulative emissions graphs go back to 1750 Our World in Data. I'll check few more sources tomorrow, including WP:Tertiary sources, to see how they cover it. Bogazicili (talk) 17:38, 2 November 2024 (UTC)
- The prose quality of the first paragraph was definitely better in that version at least. I don't think "adding to greenhouse gases" is correct English. If I can find time, I might suggest a new version of our opening in a separate discussion section.
- My guess is that many sources don't talk about "industrial revolution" in their first paragraph, instead only use that when they go into the weeds of the topic.
- NASA describes it as happening from the mid-20th century in their first paras (https://science.nasa.gov/climate-change/what-is-climate-change/)
- Met Office describes it similar to us (https://www.metoffice.gov.uk/weather/climate-change/what-is-climate-change), from the mid-1850s we started polluting.
- WMO doesn't describe the time period, except by refering to a pre-industrial baseline (https://wmo.int/topics/climate-change)
- —Femke 🐦 (talk) 18:03, 2 November 2024 (UTC)
@Femke: here are some WP:Tertiary sources I found with Oxford Reference Online database through Wikipedia Library.
There are lots of results. Only some of them are below:
The first two have detailed entries. I'd recommend you to check them:
- Encyclopedia of Climate and Weather (2 ed.) doi:10.1093/acref/9780199765324.001.0001. Global Warming entry. Notes both pre-industrial increase and increase since 1970.
The term global warming has become synonymous in the press with human-induced climate change. ... Carbon dioxide concentrations in the atmosphere have increased such that 2009 values of about 385 ppmv are over 36 percent higher than preindustrial values of 280 ppmv and over half that increase has occurred since 1970 (Figure 1).
- Encyclopedia of Global Change doi:10.1093/acref/9780195108255.001.0001.
- Climate Change entry:
An Overview
... During the past two centuries, anthropogenic activity has resulted in large increases in the atmospheric greenhouse gas content, which has caused a detectable increase in global temperatures and are predicted to continue to increase for many decades before the climate system reaches a new equilibrium. [See Greenhouse Effect; and Global Warming.] ...- Global warming entry:
..Levels rose to 275 ppmv during the warm interglacial phases, and that level is also considered representative of the preindustrial era of the nineteenth century...
The two below have shorter entries:
- A Dictionary of Weather (3 ed.) doi:10.1093/acref/9780191988356.001.0001. Separate entries for global warming and climate change (climatic change). Not mentioned there.
- A Dictionary of Human Geography doi:10.1093/acref/9780199599868.001.0001. Climate change entry. Not mentioned there, but source mentions Anthropocene.
- By the way, there is an entire encyclopedia on climate change communication, The Oxford Encyclopedia of Climate Change Communication.
I think we should mention something like pre-industrial in the first paragraph. But we can shift things around. For example, the last sentence in first paragraph cites IPCC AR6 WG1 Technical Summary 2021, p. 67. That page mentions:
Since 1750, changes in the drivers of the climate system are dominated by the warming influence of increases in atmospheric GHG concentrations and a cooling influence from aerosols, both resulting from human activities
p.4:
Observed increases in well-mixed greenhouse gas (GHG) concentrations since around 1750 are unequivocally caused by human activities
I'll make my proposal below in a new section Bogazicili (talk) 19:02, 3 November 2024 (UTC)
Article housekeeping
[edit]Thanks Femke for removing unused references and other tidying. I could pitch in to help with that kind of thing for an hour or two this week. What else needs to be done? Clayoquot (talk | contribs) 02:26, 31 October 2024 (UTC)
- Just to let you know, I intend to clean up after myself, but got sidetracked. For the areas I edited, some of the citations aren't to chapters but to overall IPCC reports. I'll be fixing those. Bogazicili (talk) 16:54, 31 October 2024 (UTC)
- Thanks Bogazicili!
- In terms of housekeeping, I try to do the following every one/two years:
- See if overcitation has slipped in, which is often a red flag for text-source integrity issues. One example is overcitation after "Smaller contributions come from black carbon, organic carbon from combustion of fossil fuels and biofuels, and from anthropogenic dust", which has 6 sources. (I you could help here!)
- Check if jargon such as anthropogenic has slipped back in, and reword using plain English
- Reread the article, and check if there is text-source integrity for surprising statements
- Reread the article, and update numbers which need updating.
- —Femke 🐦 (talk) 17:19, 1 November 2024 (UTC)
- Not that big of an issue, but the source formatting is also slightly messy and inconsistent in places (e.g. Harvnb is used for most things but not all, some things are missing various fields, etc). Sgubaldo (talk) 19:17, 1 November 2024 (UTC)
- Wow, that's a lot of work that you've been doing regularly! I'll take on the overcitation thing. Will indicate here when I've finished checking. Clayoquot (talk | contribs) 19:42, 1 November 2024 (UTC)
- I'll have much more time to work on this tomorrow (Sunday). I think I added most of the AR6 citations. I'll be fixing those tomorrow. And then I can also pitch in with the rest of the housekeeping. Bogazicili (talk) 17:18, 2 November 2024 (UTC)
- I think I fixed the parts I had added. Bogazicili (talk) 20:31, 5 November 2024 (UTC)
- I'll have much more time to work on this tomorrow (Sunday). I think I added most of the AR6 citations. I'll be fixing those tomorrow. And then I can also pitch in with the rest of the housekeeping. Bogazicili (talk) 17:18, 2 November 2024 (UTC)
Featured picture scheduled for POTD
[edit]Hello! This is to let editors know that File:1880- Global surface temperature - heat map animation - NASA SVS.webm, a featured picture used in this article, has been selected as the English Wikipedia's picture of the day (POTD) for November 12, 2024. A preview of the POTD is displayed below and can be edited at Template:POTD/2024-11-12. For the greater benefit of readers, any potential improvements or maintenance that could benefit the quality of this article should be done before its scheduled appearance on the Main Page. If you have any concerns, please place a message at Wikipedia talk:Picture of the day. Thank you! — Amakuru (talk) 10:18, 1 November 2024 (UTC)
Contemporary climate change involves rising global temperatures and significant shifts in Earth's weather patterns. Climate change is driven by emissions of heat-trapping greenhouse gases such as carbon dioxide and methane. Emissions come mostly from burning fossil fuels (coal, oil and natural gas), and also from agriculture, forest loss, cement production and steel making. Climate change causes sea level rise, glacial retreat and desertification, and intensifies heat waves, wildfires and tropical cyclones. These effects of climate change endanger food security, freshwater access and global health. Climate change can be limited by using low-carbon energy sources such as wind and solar energy, by forestation, and shifts in agriculture. Adaptations such as coastline protection cannot by themselves avert the risk of severe, pervasive and irreversible impacts. Limiting global warming in line with the goals of the 2015 Paris Agreement requires reaching net-zero emissions by 2050. This animation, produced by NASA's Scientific Visualization Studio with data from the Goddard Institute for Space Studies, shows global surface temperature anomalies from 1880 to 2023 on a world map, illustrating the rise in global temperatures. Normal temperatures (calculated over the 30-year baseline period 1951–1980) are shown in white, higher-than-normal temperatures in red, and lower-than-normal temperatures in blue. The data are averaged over a running 24-month window. Video credit: NASA; visualized by Mark SubbaRao
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Suggestions for the first sentence
[edit]The first sentence is awkward, and I'd love to craft a new first sentence before we get to be on the main page. The "in common usage" is especially jarring, and may fall slightly foul of WP:REFER. I have two suggestions:
- Climate change encompasses global warming—Earth’s ongoing temperature increase—and its wider effects on Earth's climate.
- Current climate change is the ongoing rise in global average temperatures and the resulting effects on Earth's climate.
It's a common thing that more text gets bolded than the title alone, to clarify immediately to the reader what the topic is where there is some need for disambiguation. I think this may release us from the need to be a bit pedantic in the introduction. —Femke 🐦 (talk) 19:26, 2 November 2024 (UTC)
- The preamble "In common usage" distinguishes current CC from "Climate change in a broader sense" that's in the second sentence. The distinction is important since we should (must?) quickly define the article title, focus attention on what this article is about, and link to the other article (Climate variability and change). I remember the community grappling with how to achieve these goals; the current text was the result. "In common usage" isn't jarring, though some might call it a bit formal. "Current climate change" (suggestion 2) isn't a much-used term. —21:10 The current wording tells the reader immediately that common-use "CC" is not the academically correct use. Of Suggestion 1 and 2, though, I definitely prefer Suggestion 1. —RCraig09 (talk) 22:23, 2 November 2024 (UTC)
- The distinction is not between "academic usage" and "common usage". Academics use the terms like everybody else in their papers. IPCC has it in their name, WMO classifies their reporting under climate change. The difference is between definitionally and non-definitionally. If you have a sentence with is, you imply a definition, so we need to make clear in some way that we're talking about "Contemporary", "Present-day", "Current" climate change. What we can do as well is 2b:
- 2b. Current/present-day/contemporary Climate change ...
—Femke 🐦 (talk) 09:00, 3 November 2024 (UTC)
- I prefer 'Contemporary' to 'Current', but I like the wording in Suggestion 1 more. My suggestion would be something like:
- Contemporary climate change encompasses global warming—the ongoing increase in global average temperature—and its wider effects on Earth's climate.
- Also, if the first sentence changes, the next two will probably need tweaking too. Sgubaldo (talk) 12:20, 3 November 2024 (UTC)
- I wonder what percentage of the population knows what "contemporary" means. I'd estimate less than 80/90%, hence my suggestions for slightly less elegant wording. Two difficult words close to each other (contemporary/encompasses), makes it more difficult to guess the word meaning for those unaware. —Femke 🐦 (talk) 12:23, 3 November 2024 (UTC)
- In that case, I would propose: "Present-day climate change includes both global warming—the ongoing increase in global average temperature—and its wider effects on Earth's climate." Sgubaldo (talk) 12:52, 3 November 2024 (UTC)
- I like that variation. Present-day may prevent some knee-jerk reactions of Wikipedians trained to remove the word MOS:Current from articles. —Femke 🐦 (talk) 12:58, 3 November 2024 (UTC)
- In that case, I would propose: "Present-day climate change includes both global warming—the ongoing increase in global average temperature—and its wider effects on Earth's climate." Sgubaldo (talk) 12:52, 3 November 2024 (UTC)
- I wonder what percentage of the population knows what "contemporary" means. I'd estimate less than 80/90%, hence my suggestions for slightly less elegant wording. Two difficult words close to each other (contemporary/encompasses), makes it more difficult to guess the word meaning for those unaware. —Femke 🐦 (talk) 12:23, 3 November 2024 (UTC)
Pinging all those with recent talk page activity: @Clayoquot, Amakuru, Bogazicili, Chipmunkdavis, Sunrise, and Alaexis:. —Femke 🐦 (talk) 09:31, 3 November 2024 (UTC)
- I prefer the first one because it includes the other common term, global warming. Global warming also redirects to this page, as it should. Bogazicili (talk) 14:28, 3 November 2024 (UTC)
- I concede Femke's point (09:00) re academics/definitions. My concern is to explicitly convey that there are two definitions of CC. This distinction parallels the fact that today's CC is different from historical/generic CC. Detail: reviewing https://www.thesaurus.com/browse/contemporary, I'm OK with "current" or "present" or "present-day" or "recent" or "ongoing" or "newfangled" (well, maybe not "newfangled :-) :-). —RCraig09 (talk) 17:03, 3 November 2024 (UTC)
- I think it's more elegant to do it implicitly (present-day climate change), rather than explicitly. We want people to read about the topic of climate change, rather than about the intricacies of how terms are used in the first paragraph. —Femke 🐦 (talk) 17:06, 3 November 2024 (UTC)
- By "explicitly" I didn't mean super-ultra-formally. I think the distinction of definitions is accomplished by the second sentence, "Climate change in a broader sense...". That's all I meant. I'm OK with most of the smaller-change proposal I've read in this discussion. —RCraig09 (talk) 17:11, 3 November 2024 (UTC)
- I think it's more elegant to do it implicitly (present-day climate change), rather than explicitly. We want people to read about the topic of climate change, rather than about the intricacies of how terms are used in the first paragraph. —Femke 🐦 (talk) 17:06, 3 November 2024 (UTC)
- I have a slight preference for Sgubaldo's proposal. All of them sound fine to me though. Clayoquot (talk | contribs) 17:17, 3 November 2024 (UTC)
- Just to clarify, since there are multiple proposals. I'm ok with this latest one: "Present-day climate change includes both global warming—the ongoing increase in global average temperature—and its wider effects on Earth's climate." Bogazicili (talk) 17:43, 3 November 2024 (UTC)
- If no one objects, I'll wait until tomorrow to see if there's any more replies, and then I'll make the changes. Sgubaldo (talk) 19:12, 3 November 2024 (UTC)
- Changes made. Sgubaldo (talk) 12:43, 4 November 2024 (UTC)
FYI: removed 'mainly' from lead
[edit]I changed "The current rise in global average temperature is mainly driven by human activities, especially fossil fuel burning since the Industrial Revolution" to "The current rise in global average temperature is mainly driven by human activities, especially fossil fuel burning since the Industrial Revolution". The best guess is taht 100% of climate change is driven by human activities (per new source), so the old wording was misleading and the old source didn't talk about this. The word driven itself also doesn't require 100% causation (that would be is caused by), so even when the percentage of human-induced climate change deviates from observed climate change, this wording should remain correct.
I did this boldly, as the old text was not really supported and misleading. Hope that's okay. —Femke 🐦 (talk) 10:20, 3 November 2024 (UTC)
- Agree. As Earth was on a very slight cooling trend for ~10,000 years, I remember reading that humans cause "more than" 100% of global warming, though it would be confusing to say that literally. —RCraig09 (talk) 17:07, 3 November 2024 (UTC)
- The idea of a Holocene Thermal Maximum some 8,000 years ago is a bit contested. Regional climate proxies say there was one, but globally it's a more complex picture, and models think there's been continuous warming / stable temperatures.
- The more than 100% since pre-industrial also isn't true anymore as I understand it, as the last couple of years have seen very rapid warming. The source I cited is also the one used by the IPCC, and they say the best guess is exactly 100% caused by humans with some uncertainty. —Femke 🐦 (talk) 17:17, 3 November 2024 (UTC)
- @Femke: do you still want to remove "since the Industrial Revolution" part? That can be reworded and moved to the last sentence. Proposal below. Bogazicili (talk) 20:30, 3 November 2024 (UTC)
The lead, first paragraph
[edit]This is what the first paragraph of the lead would look like, after recent changes and suggestions in Talk:Climate_change#Suggestions for the first sentence and Talk:Climate_change#Paper about our work & suggestions and above section.
Didn't include the sources in the article, and some of the new sources are above. For the "accelerating in the past 50 years", I will use [2].
|
Bogazicili (talk) 19:31, 3 November 2024 (UTC)
- I think the the new text is not great for flow. Most of the sentences are roughly the same lenght, with makes for slightly uncomfortable reading. I don't feel strongly about removing "industrial revolution", but I don't think moving it to later is that much of a change? —Femke 🐦 (talk) 21:52, 3 November 2024 (UTC)
- I suggested the changes with this criticism in mind.
Why is it so hard to arrive at a clear understanding of when climate change is happening and why do temporal constructions of this event vary so broadly
- Now we have two clear dates (since 1750 and accelerating in the past 50 years). Bogazicili (talk) 22:02, 3 November 2024 (UTC)
- I suggested the changes with this criticism in mind.
References
Proposed replacement of graphic in "Impacts" section
[edit]I've long questioned the value of the "soil moisture" graphic in the short, crowded, under-emphasized "Impacts" section.
The existing graphic's content is not discussed in article text. Also, soil moisture's broader implication on the impacts affecting humans is speculative and indirect, perhaps even suggesting that things'll get better and better for sub-Saharan Africa. (Aside: I speak out against captions that merely repeat what's in the graphic's own legends/text.)
Meanwhile, the impacts on humans of progressively more intense hurricanes is immediately and intuitively evident (see also ). I realize Graphic B is not global and is only one year's hurricanes, but I think the graphic speaks to a more striking and immediate impact of climate change.
Please comment below, on your preference. —RCraig09 (talk) 23:19, 29 November 2024 (UTC)
- While I'm open to replacing that graph, I'm not a fan of adding another US-focused one in its place. Is it possible to do something similar for tropical cyclones in general? —Femke 🐦 (talk) 08:21, 30 November 2024 (UTC)
- It's Atlantic focused, not "US" focused per se. I've searched for CC-intensified (Pacific) typhoons but references applying extreme event attribution to specific hurricanes/cyclones/typhoons are nearly non-existent. This chart was a rare discovery in how it makes CC's effects be concretely evident. If anyone finds similar references for the Pacific, let me know.. —RCraig09 (talk) 17:51, 30 November 2024 (UTC)
- The soil moisture graph was added by User:Efbrazil three years ago. I think we could probably remove it (or move it?) but I am a bit concerned that we don't mention "soil moisture" content anywhere in the text (or is it mentioned under a different term?). I was going to suggest to move it to effects of climate change but I see it's already there. - I think my suggestion would be to remove it but to not replace it with another fairly complicated, wordy schematic (such as graph B.). Either remove it without replacement or replace it with something very visual (a photo?). In general, we do have a lot of graphs, schematics and images already in this article. Perhaps one less is actually a good thing. EMsmile (talk) 13:22, 30 November 2024 (UTC)
- Droughts are mentioned. Bogazicili (talk) 21:29, 1 December 2024 (UTC)
- I'd rather have this image chosen for the replacement than the other file. I do not believe using an image for one season restricted in one basin would reflect climate change's general impact on tropical cyclones. I'm a bit cautious on replacing the existing image, but I want to see more people discussing before I issue my final verdict. ZZZ'S 18:21, 30 November 2024 (UTC)
- Keep. Temperature, soil, precipitation are the 3 graphs in B. Future Climate Change, Risks, and Long-Term Responses in AR6 SYR SPM (page 14). We already have temperature in the article. Bogazicili (talk) 21:25, 1 December 2024 (UTC)
- RCraig09, I'd recommend here for image B: Effects_of_climate_change#Extreme_storms Bogazicili (talk) 21:32, 1 December 2024 (UTC)
Mentioning SRM under "Reducing and recapturing emissions"
[edit]Hello! I am new to this talk page. I have been working on the SRM article and noticed that SRM is mentioned in the Climate Change article. I have some questions about how SRM is mentioned in this article.
Should SRM really be mentioned under the heading "Reducing and recapturing emissions"?
Given that SRM would only ‘mask’ climate change instead of addressing the cause, greenhouse gas emissions. "SRM contrasts with climate change mitigation activities, such as emission reductions and carbon dioxide removal (CDR), as it introduces a ‘mask’ to the climate change problem by altering the Earth’s radiation budget, rather than attempting to address the root cause of the problem, which is the increase in greenhouse gases (GHGs) in the atmosphere" (IPCC_AR6_WGII_CCB-CWGB, p. 77).
I suggest either deleting the two sentences on SRM altogether or clearly explaining to the readers that SRM is somewhat related but is not a mitigation option in the pure sense. 1HumbleB (talk) 12:00, 6 December 2024 (UTC)
- I agree with 1HumbleB's concerns (disclosure: we have worked together on the solar radiation modification article; that's how I got interested in this). For comparison, in the article climate change mitigation we have quite a good description of what SRM has to do with mitigation (or doesn't have to do with it). I have just moved that section further down in the article; it was under "definition" there until now which I don't think was ideal. It reads like this at the climate change mitigation article:
- == Related approaches ==
- === Relationship with solar radiation modification (SRM) ===
- While solar radiation modification (SRM) could reduce surface temperatures, it temporarily masks climate change rather than addressing the root cause, which is greenhouse gases.[1]: 14–56 SRM would work by altering how much solar radiation the Earth absorbs.[1]: 14–56 Examples include reducing the amount of sunlight reaching the surface, reducing the optical thickness and lifetime of clouds, and changing the ability of the surface to reflect radiation.[2] The IPCC describes SRM as a climate risk reduction strategy or supplementary option rather than a climate mitigation option.[1]
- The terminology in this area is still evolving. Experts sometimes use the term geoengineering or climate engineering in the scientific literature for both CDR or SRM, if the techniques are used at a global scale.[3]: 6–11 IPCC reports no longer use the terms geoengineering or climate engineering.[4] EMsmile (talk) 10:15, 7 December 2024 (UTC)
References
- ^ a b c IPCC (2022) Chapter 14: International cooperation in Climate Change 2022: Mitigation of Climate Change. Contribution of Working Group III to the Sixth Assessment Report of the Intergovernmental Panel on Climate Change, Cambridge University Press, Cambridge, United Kingdom and New York, NY, United States]
- ^ National Academies of Sciences, Engineering (25 March 2021). Reflecting Sunlight: Recommendations for Solar Geoengineering Research and Research Governance. doi:10.17226/25762. ISBN 978-0-309-67605-2. S2CID 234327299.
- ^ IPCC (2022) Chapter 1: Introduction and Framing in Climate Change 2022: Mitigation of Climate Change. Contribution of Working Group III to the Sixth Assessment Report of the Intergovernmental Panel on Climate Change, Cambridge University Press, Cambridge, United Kingdom and New York, NY, United States
- ^ IPCC, 2021: Annex VII: Glossary [Matthews, J.B.R., V. Möller, R. van Diemen, J.S. Fuglestvedt, V. Masson-Delmotte, C. Méndez, S. Semenov, A. Reisinger (eds.)]. In Climate Change 2021: The Physical Science Basis. Contribution of Working Group I to the Sixth Assessment Report of the Intergovernmental Panel on Climate Change [Masson-Delmotte, V., P. Zhai, A. Pirani, S.L. Connors, C. Péan, S. Berger, N. Caud, Y. Chen, L. Goldfarb, M.I. Gomis, M. Huang, K. Leitzell, E. Lonnoy, J.B.R. Matthews, T.K. Maycock, T. Waterfield, O. Yelekçi, R. Yu, and B. Zhou (eds.)]. Cambridge University Press, Cambridge, United Kingdom and New York, NY, USA, pp. 2215–2256, doi:10.1017/9781009157896.022.
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