Guardian: Gordon Brown tonight led a chorus of condemnation against "flat-earth" climate change sceptics who have tried to derail the Copenhagen summit by casting doubt on the evidence for global warming. Sceptics in the UK and the US have moved to capitalise on a series of hacked emails from climate change scientists at the University of East Anglia, claiming they show attempts to hide information that does not support the case for human activity causing rising temperatures. On the eve …