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Are Humans the Major Cause of Global Warming? | Union of Concerned Scientists
Basics of Climate Change | US EPA
Greenhouse gases' effect on climate - U.S. Energy Information Administration (EIA)
Climate change: evidence and causes | Royal Society
Global Warming / Climate Change Frequently Asked Questions (FAQ) | EESI
Greenhouse effect | Definition, Diagram, Causes, & Facts | Britannica
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Climate Change Indicators: Greenhouse Gases | US EPA
Greenhouse Effect 101 | NRDC
Cause and effect for global warming - Time for Change
