Greenhouse gas - Wikipedia
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Attribution of recent climate change - Wikipedia
Greenhouse gas emissions by the United States - Wikipedia
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Greenhouse gas emissions by the United States - Wikipedia
Greenhouse gas emissions - Wikipedia
File:1990- Annual greenhouse gas emissions - U.S. - line chart.svg - Wikipedia
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Greenhouse gas intensity of national economies, The nationa…
Controversial issues in the ''global warming'' Wikipedia article.
Greenhouse gas - Wikipedia
File:Greenhouse gas emissions from agriculture, by region, 1990-2010.png - Wikipedia
Greenhouse gas - Simple English Wikipedia, the free encyclopedia
Greenhouse effect - Wikipedia
File:NOAA Annual Greenhouse Gas Index 2012.png - Wikipedia
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