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"To place the planetary consequences of dietary choices in a broader context, it only requires a dietary intake from animal products of ∼20%, well below the national average, 27.7%, to increase one’s GHG footprint by an amount similar to the difference between an ultraefficient hybrid (Prius) and an average sedan (Camry). For a person consuming a red meat diet at ∼35% of calories from animal sources, the added GHG burden above that of a plant eater equals the difference between driving a Camry and an SUV. These results clearly demonstrate the primary effect of one’s dietary choices on one’s planetary footprint, an effect comparable in magnitude to the car one chooses to drive."

Diet, Energy, and Global Warming