One cotton t-shirt has a water footprint of 659 gallons. 26 percent of energy used in homes is for lighting and other appliances Just 2% of the nation's livestock farms raise 40 percent of all slaughtered animals in the US. $ of a gal. of gas includes: cost of Crude Oil 76%; Refining Costs and Profits 6%; Distribution, Marketing, and Retail Costs and Profits 6%; Taxes 12% 20 percent of energy used