The global warming situation has become so dire that Barack Obama’s chief scientific adviser has raised with the president the possibility of massive-scale technological fixes to alter the climate known as ‘geo-engineering’. John Holdren, who is a member of the president’s cabinet, said today the drastic measures should not be “off the table” in discussions on how best to tackle climate change. While his office insisted that he was not proposing a dramatic switch in policy, Holdren said geo-engineering could not be ruled out.

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