India, June 16 -- Arctic Sea ice retreated record fast in spring 2020; also, the summer sea ice was only half as large as decades ago

Is global warming still reversible? No, thinks the scientist who led the world's largest expedition to the Arctic.

Arctic Sea ice retreated record fast in spring 2020 ; also, the summer sea ice was only half as large as decades ago. These proved the world has crossed a tipping point , Markus Rex told news agency AFP .

Temperatures at the time of Rex's expedition were 10 degrees higher than during the Fram expedition undertaken by Fridtjof Nansen and Hjalmar Johansen in the 1890s, according to AFP .

The expedition led by Rex had involved 300 scientists from 20 countries. It had spent almost 400 days in t...