Copenhagen: The world's leading scientists issued a desperate plea to politicians to act on climate change, amid warnings that without action the world faces decades of social unrest and war.


In what was described as a watershed moment, more than 2,500 leading environmental experts agreed a statement that called on governments to act before the planet becomes an unrecognisable - and, in places, impossible - place to live.


At an emergency climate summit in Copenhagen, scientists agreed that "worst case" scenarios were already becoming reality and that, unless drastic action was taken soon, "dangerous climate change" was imminent.

In a strongly worded message appealed directly to politicians, they said there was "no excuse for inaction" and that "weak and ineffective governments must stand up to big business and vested interests".

Steps should be "vigorously and widely implemented", they said, to reduce greenhouse gases. Failure to do so would result in "significant risk of irreversible climatic shifts", the statement added.
The plea came as Lord Stern, the former chief economist of the World Bank whose report two years ago drew attention to the possible results of global warming, told the conference that unless politicians grasped the gravity of the situation it would be "devastating".
Increases in average temperatures of six degrees by the end of the century were an increasing possibility and would produce conditions not seen on Earth for more than 30 million years, he said.

That could mean massive rises in sea level, whole areas devastated by hurricanes and others turned into uninhabitable desert, he claimed, forcing billions of people to leave their homelands.