Times (UK): Climate change is an existential threat. It presents huge challenges to governments and, inevitably, we will have to pay a significant price to keep the temperature from rising by more than two degrees. Politicians across the world increasingly understand this. This is in itself a big step forward in the build-up to the Copenhagen Conference later this year. But it is one thing to understand that there is a problem and another to find a way to address it. So far very little has been …