More information about the study of Earth’s hothouse climate 50 million years ago (The Atlantic). This feature article by the noted author Peter Brannen fills in many of the details from a study published on July 30 and given a short review in CL#1224. The study itself has a link but lacks open access. Brannen does an admirable reviewing job and has also talked to the authors for some further insights. It is such an interesting subject because the atmospheric CO2 level at that time is now thought to have been no more than around 1000 ppm, which is within reach before long if we let things get out of control.
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–In this post, closely related, Peter Sinclair provides two brief videos that contain separate explanations from scientists about the way methane can contribute to such heating episodes when produced excessively. Methane levels tend to rise at a quickened pace in the presence of abnormal temperature increases which have likely been initiated by carbon dioxide.
–A new methane study is in the news today, with evidence showing present disturbances in an important methane sink. This is one way that atmospheric levels could accelerate upward for this very powerful greenhouse gas. Carbon Brief does a good job of explaining why there are so many scientists who worry about methane. https://www.carbonbrief.org/methane-uptake-from-forest-soils-has-fallen-77-per-cent-three-decades
Another new study, just published, explains the way a succession of feedback effects can contribute to extraordinary temperature increases. This report was written by a group of scientists who specialize in the study of Earth systems analysis and have become renowned in that field, with Will Steffen as the lead author. The feedbacks, which are all listed and described, are each triggered when a particular tipping point temperature has been reached. The entire process “can potentially act like a row of dominoes. Once one is pushed over, it pushes Earth towards another.” The danger of this happening becomes pronounced as temperatures rise above the 1.5C target level, which today remains largely controlled by the forcing action of CO2 emissions.
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There is a rising threat for flash floods of extraordinary size (Inside Climate News). These floods occur when warm and heavy rains in mountainous areas fall on deep snowpacks, rapidly melting the snow. “If greenhouse gas emissions are allowed to continue at their current pace, the odds of severe rain-on-snow floods could triple in 10 Western rivers.”
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A feature article about the incredible popularity of palm oil and its threat to the environment (Deutsch Welle). It’s called “too much of a good thing.”
Carl