Guardian: A little after 11.30 yesterday morning, a Boeing 747 running on jet fuel and the oil from 150,000 coconuts parted company with the runway at Heathrow and slipped into a hazy blue sky. Forty minutes later, the first commercial aircraft to be powered partly by biofuel touched down at Schiphol airport in Amsterdam, paving the way for what some claim could be a revolution in environmentally responsible aviation. The experiment was the brainchild of the Virgin Atlantic boss, Sir …