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The single biggest impact a person can have on the Earth is driving a car, either driving a fuel-efficient car or just driving it less.
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I find both humor and grimness in most issues.
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Burning carbon-based substances like oil, gas, and especially coal, produces billions of tons of extra carbon dioxide each year. Methane gas from cows and pigs and other animals on our large farms ends up in the atmosphere as well, trapping more of the sun's energy as heat.
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I'm an educator. You do what you have to do to get what you are saying across, and if that means being funny, that's what I do.
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I can be educational, but if I'm not funny and entertaining, too, who's going to come and listen to me or watch me on TV.