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High school students conducting an experiment regarding the greenhouse effect. Jamil Khan, Matt McConnell, Brenda Chunga, John Dodson (black t-shirt), on May 13, 1996. (Photo by Maureen Keating/CQ Roll Call via Getty Images)

High school students conducting an experiment regarding the greenhouse effect. Jamil Khan, Matt McConnell, Brenda Chunga, John Dodson (black t-shirt), on May 13, 1996. (Photo by Maureen Keating/CQ Roll Call via Getty Images)

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