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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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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Index 1, 2, 3, 4, 5, 6, 7, 8, 9, 10 11, 12, 13, 14, 15, 16, 17, 18, 19, 20 21, 22, 23, 24, 25, 26, 27, 28, 29, 30 31, 32, 33, 34, 35, 36, 37, 38, 39, 40 41, 42, 43, 44, 45, 46, 47, 48, 49, 50 51, 52, 53, 54, 55, 56, 57, 58, 59, 60 61, 62, 63, 64, 65, 66, 67, 68, 69, 70 71, 72, 73, 74, 75, 76, 77, 78, 79, 80 81, 82, 83, 84, 85, 86, 87, 88, 89, 90 91, 92, 93, 94, 95, 96 |
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Daily pageviews of this article (experimental) Pageviews summary: size=91, age=27, days=60, min=2044, max=3706, latest=3101.
The pageviews file should be updated soon. If not updated before age exceeds 30 days, the chart will be hidden until it is. See § Maintenance.
│ 0 │ 370 │ 740 │ 1110 │ 1480 │ 1850 │ 2220 │ 2590 │ 2960 │ 3330 │ 3700 page views for Climate change |
RFC: Food and health section 2
[edit]Which of the following versions should be used in the Food and health section? A is the current version in the article and B is the new version. This is a follow-up RfC. A previous RfC was conducted after a Dispute Resolution Noticeboard case. Version B below was preferred over another suggested new version, mainly due to length. In the previous RfC, the current version wasn't given as a specific option. Bogazicili (talk) 21:14, 23 July 2024 (UTC)
A. Current version, 243 words
The World Health Organization (WHO) calls climate change the greatest threat to global health in the 21st century.[1] Extreme weather leads to injury and loss of life.[2] Various infectious diseases are more easily transmitted in a warmer climate, such as dengue fever and malaria.[3] Crop failures can lead to food shortages and malnutrition, particularly effecting children.[4] Both children and older people are vulnerable to extreme heat.[5] The WHO has estimated that between 2030 and 2050, climate change would cause around 250,000 additional deaths per year. They assessed deaths from heat exposure in elderly people, increases in diarrhea, malaria, dengue, coastal flooding, and childhood malnutrition.[6] By 2100, 50% to 75% of the global population may face climate conditions that are life-threatening due to combined effects of extreme heat and humidity.[7]
Climate change is affecting food security. It has caused reduction in global yields of maize, wheat, and soybeans between 1981 and 2010.[8] Future warming could further reduce global yields of major crops.[9] Crop production will probably be negatively affected in low-latitude countries, while effects at northern latitudes may be positive or negative.[10] Up to an additional 183 million people worldwide, particularly those with lower incomes, are at risk of hunger as a consequence of these impacts.[11] Climate change also impacts fish populations. Globally, less will be available to be fished.[12] Regions dependent on glacier water, regions that are already dry, and small islands have a higher risk of water stress due to climate change.[13]
B. Suggested new version, 235 words
The World Health Organization calls climate change the greatest threat to global health in the 21st century.[1] Over 100 scientists writing in The Lancet have warned about the irreversible harms it poses.[2] Extreme weather events affect public health, and food and water security.[3][4]p. 9 Temperature extremes lead to increased illness and death.[5][6] Climate change increases the intensity and frequency of extreme weather events.[7]p.9 It can affect transmission of infectious diseases.[8] [9] According to the World Economic Forum, 14.5 million more deaths are expected due to climate change by 2050.[10] 30% of the global population currently live in areas where extreme heat and humidity are already associated with excess deaths.[11] By 2100, 50% to 75% of the global population would live in such areas.[12]p. 988
While total crop yields have been increasing in the past 50 years due to agricultural improvements, climate change has already slowed the rate of yield growth.p. 9 Fisheries have been negatively affected in multiple regions.p. 9 Agricultural productivity was negatively affected in mid- and low-latitude areas, while some high latitude areas were positively affected. p.9 An increase in drought in certain regions could cause 3.2 million deaths from malnutrition by 2050 and stunting in children.[13] With 2C warming, global livestock headcounts could decline by 7-10% by 2050, as less animal feed will be available.p.748 If the emissions continue to increase for the rest of century, then over 9 million climate-related deaths would occur annually by 2100.p.63
C. Something else - Please provide a complete section.
Please enter A, B, or C (with the text) in the Survey. Please do not respond to the statements of other editors in the Survey.
Survey (Food and health 2)
[edit]- B as the nominator. Version B uses updated sources. It also uses a wide range of sources, such as IPCC, medical professionals (WHO), business community (World Economic Forum) and other scientists ("Over 100 scientists writing in The Lancet" sentence). Some of the changes were made to accommodate concerns during the Dispute Resolution Noticeboard process, such as the livestock headcounts sentence. Bogazicili (talk) 21:26, 23 July 2024 (UTC)
Discussion (Food and health 2)
[edit]- It might be helpful to provide a list of the exact differences between versions. I'd also separate out those that are minor or likely to be uncontroversial (e.g. the removal of the acronym WHO in the first sentence), and either add them to the current version first, or leave them out until afterwards. These are edits that probably don't need an RfC, but including them could mean that it's less clear what editors are being asked to evaluate. I'd also recommend formatting the references in the proposal to make it easier to compare them between versions. (This is a general comment on RfC structure, not related to my role as the closer of the previous RfC.) Sunrise (talk) 02:54, 25 July 2024 (UTC)
- Sunrise, because we use short in-line references in this article, changing the references in the current version is a hassle. Some are also bundled references. So, honestly, I don't want to spend too much time on it. The references in the new version are directly accessible. If the new text is adopted, the reference format will be changed accordingly.
- About the differences, feel free to ask questions. To me, the main differences are:
- Better summary in the new version.
- Using 2024 World Economic Forum study in the new version.
- Added baseline for the "By 2100, 50% to 75% of the global population may face climate conditions..." sentence into the new version: "30% of the global population currently live in..."
- I dropped any mention about global hunger projections in the new version. "Up to an additional 183 million people worldwide, particularly those with lower incomes, are at risk of hunger as a consequence of these impacts" comes from a 2019 IPCC source. Newer IPCC Sixth Assessment Report is more measured. But even Sixth Assessment Report contradicts a newer review article [14]. And that review article is published in Nature (journal), so it's a very high quality source. As such, any mention of global hunger in Wiki voice is dropped. I don't think there is any space to go over the differences in WP:Summary style, so a more limited and measured sentence is used ("An increase in drought in certain regions" )
- "reduction in global yields of maize, wheat, and soybeans" is dropped because it contradicts [15] Bogazicili (talk) 19:02, 25 July 2024 (UTC)
- If it's a binary, please add wikilinks to Option B as well. (Climate change and fisheries a good new link to add.) Option B flows more smoothly, but there are some changes I wouldn't make. "Over 100 scientists writing in The Lancet have warned about the irreversible harms it poses" doesn't seem worth including, it provides no information to the reader other than 100 scientists agree climate change is an issue. Tangible examples of broad concepts, such as specific mention of diseases such as "dengue fever and malaria" help ground the general point. B also has two separate sentences on climate-related deaths, one per paragraph, which feels redundant. CMD (talk) 03:35, 25 July 2024 (UTC)
- Will add wikilinks if the text gets adopted.
- "Over 100 scientists writing in The Lancet...": They are from different research institutions, not necessarily affiliated with IPCC, WHO, or governments. Using a wide variety of sources was one of my goals.
- "two separate sentences on climate-related deaths" One is midterm (by 2050), the other is more long term (by 2100). Bogazicili (talk) 19:09, 25 July 2024 (UTC)
- It's a good idea to use newer sources and I like the overall flow of Option B. I agree with u:CMD that there's no need to mention "100 scientists", I'd replace it with "that poses irreversible harms." Alaexis¿question? 09:36, 25 July 2024 (UTC)
- Sunrise, Chipmunkdavis, Alaexis, any comments after explanation of changes above? Bogazicili (talk) 20:54, 29 July 2024 (UTC)
- For my part, I don't intend to comment on the merits. My intention was to give advice on how I think the RfC could be improved to make it more likely to be successful. I agree with CMD's comment that wikilinks should be added as well. Sunrise (talk) 22:00, 30 July 2024 (UTC)
- Chipmunkdavis and Alaexis, I implemented some of the changes you suggested. What do you think of below?
The World Health Organization calls climate change the greatest threat to global health in the 21st century.[16] Scientists have warned about the irreversible harms it poses.[17] Extreme weather events affect public health, and food and water security.[18][19]p. 9 Temperature extremes lead to increased illness and death.[20][21] Climate change increases the intensity and frequency of extreme weather events.[22]p.9 It can affect transmission of infectious diseases, such as dengue fever and malaria.[23] [24] According to the World Economic Forum, 14.5 million more deaths are expected due to climate change by 2050.[25] 30% of the global population currently live in areas where extreme heat and humidity are already associated with excess deaths.[26] By 2100, 50% to 75% of the global population would live in such areas.[27]p. 988
While total crop yields have been increasing in the past 50 years due to agricultural improvements, climate change has already slowed the rate of yield growth.p. 9 Fisheries have been negatively affected in multiple regions.p. 9 Agricultural productivity was negatively affected in mid- and low-latitude areas, while some high latitude areas were positively affected. p.9 An increase in drought in certain regions could cause 3.2 million deaths from malnutrition by 2050 and stunting in children.[28] With 2 °C warming, global livestock headcounts could decline by 7–10% by 2050, as less animal feed will be available.p.748 If the emissions continue to increase for the rest of century, then over 9 million climate-related deaths would occur annually by 2100.p.63
Bogazicili (talk) 19:49, 27 August 2024 (UTC)
- I'd shift some tenses, but otherwise it reads well. CMD (talk) 05:20, 28 August 2024 (UTC)
- Looks good! Alaexis¿question? 08:02, 29 August 2024 (UTC)
- Great, I'll make the changes after a close request. Bogazicili (talk) 12:46, 30 August 2024 (UTC)
- I have made the changes. There are few differences from above such as sourcing (dropped [29] since it's an editorial, and used [30] instead. Added [31]), copy editing, wikilinks etc. Bogazicili (talk) 18:34, 19 September 2024 (UTC)
- Great, I'll make the changes after a close request. Bogazicili (talk) 12:46, 30 August 2024 (UTC)
References
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Drop of readership 2021
[edit]Hi everyone, I was just looking at the readership of the article and was fascinated by a sharp decrease of readership between the 2. and 3. of november 2021 ( [32] ). ... Does anyone know what caused that? Edits at that time were few and minor. I guess some redirect changed. Is there a way to find changes to redirect?
I am happy about any input.
Yours, Nsae Comp (talk) 19:08, 9 September 2024 (UTC)
- You need to look at both Global Warming [33] and Climate Change [34]. Page was moved in August 2020 [35]. But there still seems to be a drop. Bogazicili (talk) 19:38, 9 September 2024 (UTC)
- Thanks! Sorry for my confused question. Nsae Comp (talk) 02:08, 10 September 2024 (UTC)
- That sharp drop was due to the renaming but there has also been a general drop in pageviews for this article, and also for other Wikipedia articles. We've discussed the pageview drop a few times on the talk page, see e.g. here in the archive: https://en.wikipedia.org/wiki/Talk:Climate_change/Archive_86#Major_decline_in_our_page_views? . I also remember broader discussions about Wikipedia pageview drops (can't pinpoint atm where). Some of it was thought to be due to the fact that Google searches brings up Wikipedia results in a little box at the top which means readers already see it there (the start of the lead) and don't end up clicking through to Wikipedia. Similarly, some of the answers that Chat-GPT gives to readers' questions come from content in Wikipedia but the reader no longer would have to click through to Wikipedia... I'm sure there are some papers and articles on this issue somewhere. EMsmile (talk) 07:20, 10 September 2024 (UTC)
- FYI: the article was moved/renamed in August 2020. —RCraig09 (talk) 12:35, 10 September 2024 (UTC)
- That sharp drop was due to the renaming but there has also been a general drop in pageviews for this article, and also for other Wikipedia articles. We've discussed the pageview drop a few times on the talk page, see e.g. here in the archive: https://en.wikipedia.org/wiki/Talk:Climate_change/Archive_86#Major_decline_in_our_page_views? . I also remember broader discussions about Wikipedia pageview drops (can't pinpoint atm where). Some of it was thought to be due to the fact that Google searches brings up Wikipedia results in a little box at the top which means readers already see it there (the start of the lead) and don't end up clicking through to Wikipedia. Similarly, some of the answers that Chat-GPT gives to readers' questions come from content in Wikipedia but the reader no longer would have to click through to Wikipedia... I'm sure there are some papers and articles on this issue somewhere. EMsmile (talk) 07:20, 10 September 2024 (UTC)
- Thanks! Sorry for my confused question. Nsae Comp (talk) 02:08, 10 September 2024 (UTC)
Semi-protected edit request on 14 October 2024
[edit]This edit request has been answered. Set the |answered= or |ans= parameter to no to reactivate your request. |
Different regions may experience better or worse growing conditions for crops as a result of climate change. Temperature, rainfall, and frost-free days, for example, are all increasing the length of the growing season in practically every state. Longer growing seasons can benefit and hurt food production. Some farmers may be able to plant longer-maturing crops or more crop cycles entirely, when others may require additional rainfall during a longer, hotter growing season. Summiaarif (talk) 01:47, 14 October 2024 (UTC)
- Not done: it's not clear what changes you want to be made. Please mention the specific changes in a "change X to Y" format and provide a reliable source if appropriate. JTP (talk • contribs) 02:28, 14 October 2024 (UTC)
Wildfires
[edit]In the second paragraph of the lead, the second sentence states among other things that 'wildfires are becoming more common. ' Two sources are cited, one about wildfires. [1] While the idea behind the claim is correct, the claim itself is false. The IPCC source states that ' Climate change is playing an increasing role in determining wildfire regimes alongside human activity (medium confidence)'. This is not the same as wildfires becoming more common. Actually, two sentences later the IPCC states 'Global land area burned has declined in recent decades, mainly due to less burning in grasslands and savannahs (high confidence). ' Instead of using a blanket claim about all wildfires, I propose that we focus on the thing that the IPCC actually says. The source states that 'future climate variability [is] expected to enhance the risk and severity of wildfires in many biomes such as tropical rainforests (high confidence). ' This is a nice high confidence claim that illustrates the global warming-induced threat of wildfires.
- Did you check the updated IPCC report, AR6 WG2 p.9:
Observed increases in areas burned by wildfires have been attributed to human-induced climate change in some regions (medium to high confidence).
? Bogazicili (talk) 15:17, 19 October 2024 (UTC)
- Did you check the updated IPCC report, AR6 WG2 p.9:
- Good point, it's important to check their latest update. This particular statement is in agreement with their 2017 report, in that some regions have more (and/or more severe) wildfires because of climate change. The 2022 report does not give a blanket statement about wildfires in general. Panoramics (talk) 15:55, 22 October 2024 (UTC)
- However, they do say that further global warming will increase wildfires. For example, at page 55 of the technical summary of AR6 WG2, it says 'At a global warming of 2°C with associated changes in precipitation global land area burned by wildfire is projected to increase by 35% (medium confidence).' Panoramics (talk) 16:26, 22 October 2024 (UTC)
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.[2]
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)
References
- ^ IPCC SRCCL 2019, p. 45 : "Climate change is playing an increasing role in determining wildfire regimes alongside human activity (medium confidence), with future climate variability expected to enhance the risk and severity of wildfires in many biomes such as tropical rainforests (high confidence)."
- ^ Lebling, Katie; Gangotra, Ankita; Hausker, Karl; Byrum, Zachary (2023-11-13). "7 Things to Know About Carbon Capture, Utilization and Sequestration". World Resources Institute.
Scale of CCS
[edit]The article currently says:
Although its current use is limited in scale and expensive,[1] carbon capture and storage (CCS) may be able to play a significant role in limiting CO2 emissions by mid-century.[2]
I feel this sentence could use some attention for neutrality, to accurately reflect the expert consensus on realistic levels of expectations for CCS. The IEA describes "excessive expectations and reliance" on CCS and direct air capture as a common misconception.[3] By mid-century, it envisions CCS and direct air capture to mitigate 8% of energy sector emissions. The current pace of deployment of CCS is nowhere near meeting even that low target. The IPCC stated in 2022 that “implementation of CCS currently faces technological, economic, institutional, ecological-environmental and socio-cultural barriers.”[4]: 28
The current sentence comes across as optimistic, in part because of the "Although..." construction which "can have the effect of calling the validity of the first statement into question while giving undue weight to the credibility of the second" (MOS:EDITORIAL). I'm not sure if the reader will understand what "currently limited in scale" means. CCS is currently capturing one one thousandth of anthropogenic GHG emissions.
I propose changing it to:
- Carbon capture and storage (CCS) has a small but critical role in reducing emissions.[5][6]: 28 It is relatively expensive[7]: 38 and is in operation at only 44 plants as of 2024.[8]
(I will make the citation formatting consistent with article style). Courtesy pings to Dtetta and Femke who were involved in this sentence. Clayoquot (talk | contribs) 01:05, 25 October 2024 (UTC)
- I think this goes in the right direction: I don't think "significant" is really justified based on current thinking. I have three qualms with the new proposal.
- The WRI source says it "may" have a small but critical role
- The IPCC says "CCS is an option .. ", again not saying it is definitely critical
- I further doubt people understand what share of power is produced by 44 plants (0.1%, 5%?). We could be more vague here, to avoid maintenance issues.
- I showed this proposal to someone in my team to explain how Wikipedia discussion works, and he noted that the 42 of the 44 plants are CCUS plants (so frequently used for enhanced oil recovery), which makes this feel too optimistic. —Femke 🐦 (talk) 17:59, 30 October 2024 (UTC)
- Thanks for looking into this and for engaging your team.
- The IPCC uses the word critical on p. 28:
...as well as in cement and chemicals production, where it is a critical mitigation option.
Later on p. 104 it says that for industry, alternatives to CCS are difficult to represent in models thereforethe need for CCS may be overestimated
. This may be justification for using a softer phrasing. We could copy from the WRI since it's CC-BY and say "could have a critical but limited role" - would that work? - Regarding 44 plants and the share of power produced by them, it's even worse than you think. Most of these plants are not power plants; the number of power plants using CCS is 5 (until this year it wavered between 1 and 2, and then China went and opened 3). Maybe instead of giving a number of plants we should say that CCS currently captures one thousandth of anthropogenic greenhouse gas emissions - is this clearer?
- Regarding the fact that CCS usually means enhanced oil recovery, yep. And this is yet another reason to doubt the idea of CCS playing a significant role in limiting CO2 emissions by mid-century.
- The IPCC uses the word critical on p. 28:
- Clayoquot (talk | contribs) 19:06, 30 October 2024 (UTC)
- Thanks for looking into this and for engaging your team.
References
- ^ IPCC SR15 Ch4 2018, pp. 326–327 ; Bednar, Obersteiner & Wagner 2019 ; European Commission, 28 November 2018, p. 188
- ^ Bui et al. 2018, p. 1068.
- ^ "Executive summary – The Oil and Gas Industry in Net Zero Transitions – Analysis". IEA. Retrieved 2024-09-19.Text was copied from this source, which is available under a Creative Commons Attribution 4.0 International License
- ^ IPCC (2022). Shukla, P.R.; Skea, J.; Slade, R.; Al Khourdajie, A.; et al. (eds.). Climate Change 2022: Mitigation of Climate Change (PDF). Contribution of Working Group III to the Sixth Assessment Report of the Intergovernmental Panel on Climate Change. Cambridge, UK and New York, NY, USA: Cambridge University Press (In Press). doi:10.1017/9781009157926. ISBN 978-1-009-15792-6.
- ^ Lebling, Katie; Gangotra, Ankita; Hausker, Karl; Byrum, Zachary (2023-11-13). "7 Things to Know About Carbon Capture, Utilization and Sequestration". World Resources Institute. Text was copied from this source, which is available under a Creative Commons Attribution 4.0 International License
- ^ IPCC (2022). Shukla, P.R.; Skea, J.; Slade, R.; Al Khourdajie, A.; et al. (eds.). Climate Change 2022: Mitigation of Climate Change (PDF). Contribution of Working Group III to the Sixth Assessment Report of the Intergovernmental Panel on Climate Change. Cambridge, UK and New York, NY, USA: Cambridge University Press (In Press). doi:10.1017/9781009157926. ISBN 978-1-009-15792-6.
- ^ IPCC (2022). Shukla, P.R.; Skea, J.; Slade, R.; Al Khourdajie, A.; et al. (eds.). Climate Change 2022: Mitigation of Climate Change (PDF). Contribution of Working Group III to the Sixth Assessment Report of the Intergovernmental Panel on Climate Change. Cambridge, UK and New York, NY, USA: Cambridge University Press (In Press). doi:10.1017/9781009157926. ISBN 978-1-009-15792-6.
- ^ "Global Status Report 2024". Global CCS Institute. pp. 57–58. Retrieved 2024-10-19. The report lists 50 facilities, of which 3 are direct air capture facilities and 3 are transport/storage facilities
Response to WikiEd announcement
[edit]- Thanks for your interest. The Climate change article is difficult to update because it is very broad and is already a Featured article. Since your course is about coastal land loss, articles on blue carbon might be of interest and would definitely be easier. Courtesy ping to Brianda (Wiki Ed) and Rlberg4. Cheers, Clayoquot (talk | contribs) 20:22, 25 October 2024 (UTC)
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)
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