The raising of livestock consumes two-thirds of the planet's farmland, and is a major source of greenhouse gases. Meanwhile, tons of edible, sustainable protein swarms all around us, free for the taking. In a new policy paper being considered by the UN's Food and Agriculture Organization (FAO), Belgian entomologist Arnold van Huis makes the sensible recommendation that the western world eat more insects. Farming edible insects like mealworms and crickets would produce far less greenhouse gas -- 10 times less methane and 100 times less nitrous oxide -- than the large mammals we currently farm. Insects are metabolically much more...