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Global warming is likely to be slightly less severe than previously expected thanks to stronger climate policies by China and India that will offset less US action under President Donald Trump, a study showed on November 15.

But average world temperatures are still on track to rise far above the key goal set in the 2015 Paris Agreement which limited warming to "well below" 2 C above pre-industrial times, it said.

The Carbon Action Tracker (CAT) report by three independent European research groups said current policies meant the world was headed for a warming of 3.4 C by 2100, down from 3.6 C it predicted a year ago.

"This is the first time since the CAT began tracking action in 2009 that policies at a national level have visibly reduced its end of century temperature estimate," it said.

China was on track to over-achieve its pledge under the Paris Agreement to peak its carbon emissions by 2030, it said. And India was also making progress to limit a surge in emissions driven by more coal use.

A rise of 3 C in global average temperatures could cause loss of tropical coral reefs, Alpine glaciers, Arctic summer sea ice and perhaps an irreversible melt of Greenland's ice that would drive up world sea levels, a UN science panel says.

"It is clear who the leaders are here: In the face of US inaction, China and India are stepping up," said Bill Hare of Climate Analytics, one of the research groups.

Trump, who doubts that climate change is primarily caused by man-made greenhouse gas emissions, said in June that he would instead focus on promoting jobs in the US fossil fuel industry.

Hare said that it was too early to say that global emissions were peaking.

"While China's and India's emissions growths have slowed, they are still growing," especially in India, he said. "The most fundamental step to halt the global emissions growth now is for coal plants to be phased out."