Guardian: Barack Obama warned on Saturday that climate change could ravage many of Americas vaunted national parks, criticizing political opponents who pay lip service to areas of natural beauty while opposing efforts to reduce greenhouse gas emissions.
During a visit to Yosemite national park, Obama said climate change was no longer a threat, its a reality. The first sitting president to visit Yosemite since John F Kennedy in 1962 said the famed glacial valley was already experiencing changes due...