The energy report : 100% renewable energy by 2050
2011
From introduction: "WWF has a vision of a world that is powered by 100 per cent renewable energy sources by the middle of this century. Unless we make this transition, the world is most likely to avoid predicted escalating impacts of climate change. But is it possible to achieve 100 per cent renewable energy supplies for everyone by 2050? WWF called on expertise of respected energy consultancy Ecofys to provide an answer this question.