BBC: “We recognise the scientific view that the increase in global average temperature above pre-industrial levels ought not to exceed 2C,” it said. It added that the economies would work towards a global goal for substantially reducing emissions by 2050 between now and December, when the UN holds talks in Copenhagen on a successor to the Kyoto treaty. President Obama, who chaired the meeting, said the countries had had a candid and open discussion about the growing threat of …