Guardian: Deep in the rainforest, a squawk fills the air, discordant but strangely familiar. It is the sound of sanctimonious humbug from Europe’s food industry. For European food retailers stand accused of hypocrisy over buying palm oil from tropical countries such as Indonesia and Malaysia, where the widely used edible oil is often grown on land that once was rainforest. Many of them promised to buy sustainable palm oil if it became available. Now, though, their bluff has been called – …