Associated Press: The United Nations on Monday warned world leaders they have only 70 days to reach a new deal to limit global warming, while environmentalists pointed to the deadly floods in the Philippines to illustrate the already devastating impact of climate change. Only hours after negotiations began, rich and poor nations were already flinging their usual rebukes at one another for failing to do their part to reach a deal to replace the Kyoto Protocol, which expires in 2012. Talks have …