Up to three billion people could lose access to clean water supplies because global temperatures cannot now be stopped from rising by 4C.

We will reach a tipping point from which temperatures will go up even faster. The world will then start to look very different.”

this could lead to the creation of “ghost states” whose governments-in-exile would rule over scattered citizens and land lost to rising seas.

Researchers such as Richard Betts, head of climate impacts at the Met Office, calculate that a 4C rise could occur in less than 50 years, with melting of ice sheets and rising sea levels.

Devastating changes to sea levels, rainfall, water supplies, weather systems and crop yield

http://www.guardian.co.uk/