The world is in danger of hitting the point of no return for five of Earth香蕉视频直播檚 natural systems because of human-caused climate change, a team of 200 scientists said on Wednesday on the sidelines of the United Nations香蕉视频直播� climate summit.

The report on so-called 香蕉视频直播渢ipping points香蕉视频直播� 香蕉视频直播� moments when the Earth has warmed so much that certain side effects become irreversible 香蕉视频直播� looks at 26 different systems and points to five of them 香蕉视频直播� the melting of the Greenland and West Antarctic ice sheets, the dying off of warm-water coral reefs, the thawing of permafrost and impacts to a North Atlantic ocean current 香蕉视频直播� as close to triggering.

香蕉视频直播淭hese tipping points pose threats of a magnitude that has never been faced before by humanity,香蕉视频直播� said Tim Lenton, the report香蕉视频直播檚 lead author and Earth systems scientist and the University of Exeter in the U.K.

The warnings come as negotiators discuss how best to slash emissions from the burning of coal, oil and gas at the United Nations香蕉视频直播� COP28 climate summit. This year , and activists and officials alike have been ramping up their warnings that governments need to do more to curb global warming.

And those in vulnerable regions are already seeing the start of these effects.

In the Himalayas for example, glaciers are melting at such a rate that landslides, floods and other erratic weather has become common, said Izabella Koziell, from the International Centre for Integrated Mountain Development. Coral bleaching 香蕉视频直播� which happens when the water is too hot 香蕉视频直播� is blighting oceans from Australia to Florida. And some ice sheets near Earth香蕉视频直播檚 poles are disappearing at an alarming rate.

Tipping points 香蕉视频直播渃an trigger devastating domino effects, including the loss of whole ecosystems,香蕉视频直播� Lenton said.

C. R. Babu of the Centre for Environmental Management of Degraded Ecosystems at University of Delhi, agreed that Earth warming past 1.5 degrees Celsius (2.7 degrees Fahrenheit) above preindustrial times may mean 香蕉视频直播渢he extinction of natural systems.香蕉视频直播�

Abhilash S from Cochin University of Science and Technology said it was almost certain that 香蕉视频直播渟ome natural systems will be permanently damaged.香蕉视频直播�

香蕉视频直播淧rotecting them is beyond our control,香蕉视频直播� he warned. 香蕉视频直播淲e have already lost that chance.香蕉视频直播�

But the report香蕉视频直播檚 bleak outlook is tempered with a message of hope, as researchers say there are positive tipping points that can be reached too, particularly in the transition from planet-warming fossil fuels to renewable energy, people changing to plant-based diets and social movements.

香蕉视频直播淗uman history is full of examples of abrupt social and technological change,香蕉视频直播� said University of Exeter香蕉视频直播檚 Steve Smith. 香蕉视频直播淢any areas of society have the potential to be 香蕉视频直播榯ipped香蕉视频直播� in this way.香蕉视频直播�

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