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  1. Climate Change Indicators: Greenhouse Gases | US EPA

  2. Greenhouse gases: Their impact on climate change

  3. The Causes of Climate Change - Science@NASA

  4. Greenhouse gases' effect on climate - U.S. Energy Information ...

  5. Greenhouse Gases - MIT Climate Portal

  6. How do greenhouse gases actually warm the planet? - UNEP

  7. Climate change - Greenhouse Gases, Carbon Emissions, Global …

  8. Causes of Climate Change | US EPA - U.S. Environmental …

  9. What Are Greenhouse Gases and Why Do They Matter

  10. Overview of Greenhouse Gases | US EPA - U.S. Environmental …