I am writing this from Las Vegas, where our Renewable Energy World North America event has just taken place. Meanwhile, across the ocean (and much closer to my usual UK home) the world's leading climate scientists have been gathered in Copenhagen at a conference entitled Climate Change: Global Risks, Challenges and Decisions. Primarily a scientific rather than political gathering, it paves the way for COP 12, which takes place in Copenhagen in December. Though the final outcomes of the conference will not be published in full until June, the preliminary outcomes were handed over to the Danish Prime Minister on the final day – as if to say, 'we've done our bit, now it's up to you politicians.'