Guardian: On paper, the idea looks like a conservation masterstroke. Take a huge swath of pristine rainforest, put a price on the rainfall it produces and other “services”, and sell these off to rich philanthropists with a conscience. That’s precisely the rescue package dreamt up by investment house Canopy Capital. And it’s working. The London-based firm has persuaded 10 wealthy individuals to buy into the “ecosystem services” of Guyana’s heavily forested Iwokrama Reserve. The logic is …