I've just come accross an article where a group of experts say that eating insects is much better for the environment than eating meat is.
"Raising insects has a low impact on the environment. They require little water, perhaps because they obtain much of their moisture from their food. It takes 869 gallons of water to produce a third of a pound of beef, about enough for a large hamburger. By contrast, to supply water to a quarter pound of crickets, Gracer simply places a moist paper towel at the bottom of their tank and refreshes it weekly. Insects, he says, also need less food and space than vertebrate sources of protein and therefore could replace or supplement food resources that may become scarce in the future, such as fish stocks, which a recent study indicates may collapse by 2048."
http://discovermagazine.com/2008/may/07-want-to-help-the-environment-eat-insects
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