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Popular Mechanics probes the former vice president about his newly green home, his new concert series and the future of ethanol.

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Queen Elizabeth began a toast on Tuesday by teasing the president: "I wondered whether I should start this toast saying I was here in 1776, but I don't think I will." Though she has since departed our shores, the British monarch is not done teaching Americans a lesson -- her carbon footprint for the trip will be calculated and matched with a donation to an environmental charity.

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