Flies lead the way to a greener future

Is this a second agricultural revolution? "With astonishing efficiency, flies convert organic waste into fast-growing, protein-rich larvae, which are happily gobbled up by chickens, fish and pigs. Humans are finally catching up with the trend and are pouring money into the construction of vast insect farms to industrialise this age-old natural process and sell the output to farmers." John Thornhill explains how flies could help us in the fight for a greener planet.