Business Green: The first shipment of palm oil certified as environmentally sustainable by the Roundtable on Sustainable Palm Oil (RSPO) is on its way from the rainforests of Malaysia to the UK this week, where it will eventually end up on the shelves of Sainsbury’s supermarkets. Last year, the trade group launched a certification scheme designed to allow palm oil producers to prove their crops have come from legal and environmentally sustainable plantations that have not contributed to rainforest …