If global warming reaches or exceeds +2.0 Celsius, the West Antarctica Ice Sheet will pass a point of no return and melt. Nobody knows when.

According to the Potsdam Institute for Climate Impact Research, it will lead to a rise of 2.5 metres in the global sea level, flooding the world’s major port cities.

The world is currently at +1.1 Celsius above pre-industrial levels and is on track to exceed +3.0 Celsius.

"If we give up the Paris Agreement, we give up Hamburg, Tokyo and New York," warns Potsdam.

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