内容摘要：, with the aim of cutting US government spending and costs to the taxpayer.

, with the aim of cutting US government spending and costs to the taxpayer.

"Our key message is that limiting warming to 1.5C would be a major achievement - it should absolutely be our target - but in no sense will it slow or stop sea-level rise and melting ice sheets," said lead author Prof Chris Stokes, a glaciologist at Durham University.saw the world's nations agree to keep global temperature rises "well below" 2C - and ideally 1.5C.

That has often been oversimplified to mean 1.5C is "safe", something glaciologists have cautioned against for years.The authors of the new paper, published in the journal, draw together three main strands of evidence to underline this case.

First, records of the Earth's distant past suggest significant melting – with sea levels several metres higher than present - during previous similarly warm periods, such as 125,000 years ago.And the last time there was as much planet-warming carbon dioxide in the atmosphere as today - about 3 million years ago - sea levels were about 10-20m higher.

Second, current observations already show an increasing rate of melting, albeit with variation from year to year.

"Pretty dramatic things [are] happening in both west Antarctica and Greenland," said co-author Prof Jonathan Bamber, director of the Bristol Glaciology Centre.US-listed shares of the e-commerce giant fell by more than 13% on Tuesday, after the firm said its profits for the first three months of the year fell to 14.74bn yuan ($2.05bn , £1.5bn).

Earlier this month, the Trump administration ended the so-called "de minimis" exemption that allowed parcels worth less than $800 (£593) enter the US without being hit with import duties.In China, PDD has been locked in a long-running price war with rivals like Alibaba and JD.com in the face of weak consumer spending.

PDD Holdings reported a 47% drop in profit for the first quarter of the year. Its chairman, Chen Lei, said this was due to a "radical change in external policy environments such as tariffs".Mr Chen said the US-China trade war had also "created significant pressure for our merchants".