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  1. Natural gas explained Natural gas and the environment - U.S.

  2. How much does natural gas contribute to climate change …

  3. Greenhouse Gases - MIT Climate Portal

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

  5. Understanding Greenhouse Gas Emissions from Natural Gas

  6. Sources of Greenhouse Gas Emissions | US EPA - U.S.

  7. Natural gas - Wikipedia