Indeed, the rise in greenhouse gas levels appears to be accelerating, despite pledges made under the Paris Agreement to holding the increase in the global average temperature to well below 2°C above pre-industrial levels and pursuing efforts to limit the temperature increase to 1.5°C above pre-industrial levels.
The World Meteorological Organization (WMO) reported carbon dioxide (CO₂) concentrations for 2018 of 407.8 ppm (parts per million). The WMO added that CO₂ levels, as well as methane and nitrous oxide levels, had all surged by higher amounts than during the past decade.
As the image below shows, a trend based on NOAA March 1958 through October 2019 monthly mean CO₂ data at Mauna Loa points at CO₂ levels crossing the 415 ppm mark in 2020, when an El Niño is forecast to come, as discussed in an earlier post.
The added trend in the image points at CO₂ levels crossing 1200 ppm before the end of the century, triggering the cloud feedback tipping point that by itself could push up global temperatures by 8°C, within a few years. Importantly, the clouds feedback starts at 1200 ppm CO₂-equivalent. Besides a CO₂ rise, further elements could contribute to the 1200 ppm CO₂e tipping point getting reached, such as albedo changes due to disappearing Arctic sea ice and seafloor methane releases from a rapidly-warming Arctic Ocean.
In conclusion, a huge temperature rise could eventuate much earlier than by the end of the century. As discussed in the earlier post, the 2020 El Niño could be the catalyst triggering huge methane releases from the Arctic Ocean seafloor starting in 2020 and resulting in an 18°C (or 32.4°F) temperature rise within a few years time.
In the video below, John Davis discribes some of the extreme weather events that he experienced recently.
The situation is dire and calls for comprehensive and effective action, as described in the Climate Plan.
Links
• UN news release
https://www.unenvironment.org/news-and-stories/press-release/cut-global-emissions-76-percent-every-year-next-decade-meet-15degc
• Paris Agreement
https://unfccc.int/process-and-meetings/the-paris-agreement/the-paris-agreement
• United Nations Environment Programme (UNEP) - Emissions Gap Report
https://www.unenvironment.org/resources/emissions-gap-report-2019
• WMO - Greenhouse gas concentrations in atmosphere reach yet another high
https://public.wmo.int/en/media/press-release/greenhouse-gas-concentrations-atmosphere-reach-yet-another-high
• NOAA Trends in Atmospheric Carbon Dioxide
https://www.esrl.noaa.gov/gmd/ccgg/trends/data.html
• Most Important Message Ever
https://arctic-news.blogspot.com/2019/07/most-important-message-ever.html
• 2020 El Nino could start 18°C temperature rise
https://arctic-news.blogspot.com/2019/11/2020-el-nino-could-start-18-degree-temperature-rise.html
• Climate Plan
https://arctic-news.blogspot.com/p/climateplan.html
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