Associated Press: British Treasury chief Alistair Darling has urged the world’s top finance officials to reach an agreement on bearing the cost of fighting climate change before a UN summit on global warming next month. Addressing finance ministers and central bankers from the Group of 20 rich and developing nations on Saturday, Darling said that tackling climate change is an “urgent problem.” Darling wants officials to agree on a finance package to help poorer nations develop green industries …