A few weeks ago, the Union of Concerned Scientists began its competition to find the most science-friendly President.

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Those of us who live and breathe climate and energy issues know the answer to typical pop quiz questions like, "What's the nation most responsible for climate change?" Well, the largest emitter of carbon into the atmosphere is currently China, but historically the United States is responsible for the lion's share, with nearly 30% of the total emitted since the mid-1800s.

But if the question is "which corporate entity wins the dubious distinction of being the largest contributor of carbon emissions to the atmosphere?" we might struggle more.

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