Guardian: Palm oil is slippery stuff. It’s in biscuits and shampoo, biodiesel and margarine, soap and, well, roughly a third of everything you buy at the supermarket. And most of it is grown on land previously covered by rainforest in Malaysia and Indonesia. So the creation of the Roundtable on Sustainable Palm Oil (RSPO), where growers and food manufacturers, retailers and commodity traders can work out how to do things better should have been a good idea. Especially when the likes of British …