Durango Herald: Many water managers have started to agree with environmentalists about the likelihood of global warming. They disagree about how to respond. Water managers say more reservoirs like McPhee Reservoir will be needed to cope with global warming, but environmentalists say less water will be available to store, making more dams potentially obsolete before they are even built.We should build more dams, water managers say. Global warming might melt the snow earlier, making it all the more …