The UK government's leading scientist says levels of carbon dioxide in the atmosphere already represent a danger.Professor Sir David King told a London audience the world had to adapt to prepare for significant changes ahead, and also to reduce greenhouse gases.
He said climate change was "the most serious issue facing us this century and beyond", needing global solutions.
On present trends, Sir David said, the world was just 60 years from triggering an irreversible climate disaster.
[Note: the link to the BBC is via another site. See this page for an explanation. I'm going to be using this method of linking while the Beeb lets it stand, because it very effectively opens up the news to bloggers and others for discussion. ]