I read in last week's Economist that it takes 1,120 liters of water to produce 1 liter of coffee (or 140 liters per cup). Only 120 liters go into making the same amount of tea. Wine? Nearly 1,000 liters. Beer? Only about 300 liters. Here's the blurb from economist.com in case you're interested.
I guess the best thing for the planet is for us to drink tea instead of coffee, and beer instead of wine. Better yet, just drink water...and don't eat anything.
