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146

Point of no return: a hellish ‘hothouse Earth’ getting closer, scientists say (www.theguardian.com)

submitted 1 month ago by HellsBelle@sh.itjust.works to c/world@lemmy.world

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The world is closer than thought to a “point of no return” after which runaway global heating cannot be stopped, scientists have said.

Continued global heating could trigger climate tipping points, leading to a cascade of further tipping points and feedback loops, they said. This would lock the world into a new and hellish “hothouse Earth” climate far worse than the 2-3C temperature rise the world is on track to reach. The climate would also be very different to the benign conditions of the past 11,000 years, during which the whole of human civilisation developed.

The public and politicians were largely unaware of the risk of passing the point of no return, the researchers said. The group said they were issuing their warning because while rapid and immediate cuts to fossil fuel burning were challenging, reversing course was likely to be impossible once on the path to a hothouse Earth, even if emissions were eventually slashed.

The assessment, which was published in the journal One Earth, synthesised recent scientific findings on climate feedback loops and 16 tipping elements. The tipping elements include the Greenland and Antarctic ice sheets, mountain glaciers, polar sea ice, sub-Arctic forests and permafrost, the Amazon rainforest and the Atlantic meridional overturning circulation (Amoc), a system of ocean currents that strongly influences the global climate.

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[–] melsaskca@lemmy.ca 5 points 4 weeks ago (1 children)

I haven't read one of these "past the point of no return" articles in at least a month. The end is nigh and we were the makers of our own destruction all along, gets pulled out every so often, throughout history. The thing is, when it finally happens, it'll be true.

[–] crapwittyname@feddit.uk 5 points 4 weeks ago (1 children)

When what finally happens? We're a frog in a pot, there is no point where things suddenly get a thousand times worse, it happens gradually. Until the frog finally jumps out, except we can't.

[–] JohnEdwa@sopuli.xyz 1 points 4 weeks ago* (last edited 4 weeks ago)

There kinda is, as at some point the heating hits a stage where the oceans will warm up enough, and as warm water can't hold on to as much Co2, it will be released into the atmosphere, which causes the oceans to warm up, which releases Co2, which causes... And so on.
Add in some ice melting and stuff like that, and once the feedback loop starts properly, there's not much we can do to stop it.

We are a frog in a pot where we know someone is going to put a lid on it eventually, and we keep arguing and contemplating about when and how soon it might happen, instead of working on getting out of the pot before it does.