The status of Canada’s largest park as a World Heritage Site remains wobbly after a United Nations body expressed grave doubts about a federal plan to rescue it. “Considerably more effort will be needed to reverse the negative trends at a time when climate change combined with upstream industrial developments and resource extraction are intensifying,” says a draft decision on Wood Buffalo National Park from UNESCO, which manages the UN’s list of World Heritage Sites. …Parks Canada said it “recognizes the outstanding universal value of Canada’s 19 UNESCO World Heritage Sites and is committed to their ongoing protection.” Wood Buffalo, which straddles the Alberta-Northwest Territories boundary, is one of the world’s largest freshwater deltas and is the breeding ground for millions of migratory birds from four continental flyways.