From Jay Weinstein's The Ethical Gourmet:
here are some comparisons for how many liters of water it takes to produce 1 kilo of various agricultural products:
Potatoes: 500 liters
Wheat: 900 liters
Sorghum: 1,110 liters
Maize: 1,400 liters
Soybeans: 2,000 liters
Chicken: 3,500 liters
Beef (feedlot): 100,000 liters
Maize and Soybeans are grown primarily for feed.
These numbers continue to astound.
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