The climate change summit in Copenhagen was in jeopardy tonight with the complex negotiations falling far behind schedule as the climate secretary, Ed Miliband, warned of a "farce". With just two days remaining, the inability to overcome disagreements about the shape of a deal to combat global warming led to hours of inaction today , while outside the negotiations police clashed with protesters who broke through a security cordon but failed in an attempt to storm the conference centre. "We have made no progress" said a source close to the talks. "What people don't realise is that we are now...