Guardian: The decision by Ed Miliband, the energy and climate change secretary, to commit Britain to cutting its greenhouse gas emissions by 80 per cent by 2050 is welcome. Recent research has made it clear that the government’s previous target of a 60 per cent reduction would be insufficient to help halt profound climate change this century. New measures were required. But we should note that setting goals is the easy part of fighting global warming; implementing them is harder. This point is …