"Sushi tastes amazing. A great steak is just amazing." Those are not the words you expect to hear from a leader of the vegetarian movement. But that's how Graham Hill, founder of the sustainability website TreeHugger, feels about the fleshier components of his diet. He is a self-described "weekday vegetarian," a compromise that came about after years of trying--and failing--to adhere to a strictly vegetarian diet.

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