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Topics - CDN_dude

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Science / New paper by Steffen et al on Climate System Tipping Points
« on: August 07, 2018, 04:19:30 PM »
https://www.sciencedaily.com/releases/2018/08/180806152040.htm

Paper is here, now open access https://doi.org/10.1073/pnas.1810141115

The team considered ten feedbacks--"permafrost thaw, loss of methane hydrates from the ocean floor, weakening land and ocean carbon sinks, increasing bacterial respiration in the oceans, Amazon rainforest dieback, boreal forest dieback, reduction of northern hemisphere snow cover, loss of Arctic summer sea ice, and reduction of Antarctic sea ice and polar ice sheets"--and found that even if human emissions only push the temperature up to 2 C, the feedbacks could still push the global temp eventually up to 4-5 C, with sea levels eventually (doesn't say when) reaching 10-60 metres.

In other words, the tipping point for a runaway warming, Hothouse Earth may be as low as 2 C above pre-industrial when all feedback loops are taken into account. 

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