Guardian: “Save the rainforests” is an easy slogan to agree with and a very difficult one to put into practice, as delegates at the Bali climate change conference are proving. Writing for the Guardian recently, Sir Nicholas Stern put at the top of his wishlist for Bali an “international programme to combat deforestation”, and noted the problem could be halved at an annual cost of $10bn. Creating a mechanism to do this is the goal of everyone who thinks markets are the best way to …