Guardian: The general election means 2015 is a critical year for Britain. It is also a critical year for the world on climate change. Within months of Britain voting, the UN is holding a summit in Paris to agree a binding global agreement to tackle climate change. But there is a real danger that this great chance to achieve action is going to slip by, without the world even noticing. That might suit some politicians at home but it will be a disaster for our country and the world. Over recent months the EU,...