Times (UK): Gordon Brown last night raised the possibility of the Copenhagen summit failing to reach a deal as the US said that it would not improve its weak offer on cutting emissions. President Obama is expected to make a significant financial commitment to a global climate protection fund when he joins the conference on Friday rather than improve on his provisional offer of cutting emissions by 4 per cent on 1990 levels by 2020. The EU has committed to cutting its emissions by 20 per cent over …