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  1. Greenhouse gas - Wikipedia

    Greenhouse gases trap some of the heat that results when sunlight heats the Earth's surface. Three important greenhouse gases are shown symbolically in this image: carbon dioxide, water vapor, and …

  2. What Are Greenhouse Gases and Why Do They Matter

    Oct 12, 2022 · Greenhouse gases (GHGs) are a category of gases that absorb heat energy emitted from the planet's surface and they remain in Earth's atmosphere for a long time (from decades to centuries).

  3. Overview of Greenhouse Gases | US EPA

    Jan 16, 2025 · Gases that trap heat in the atmosphere are called greenhouse gases. This section provides information on emissions and removals of the main greenhouse gases to and from the …

  4. Definition, Emissions, & Greenhouse Effect - Britannica

    Nov 7, 2025 · greenhouse gas, any gas that has the property of absorbing infrared radiation (net heat energy) emitted from Earth’s surface and reradiating it back to Earth’s surface, thus contributing to …

  5. Greenhouse gases - World Meteorological Organization

    Dec 3, 2025 · Greenhouse gases (GHGs) in the atmosphere trap infrared radiation from the Earth, keeping it warm, this is known as the greenhouse effect. GHG emissions from human activities …

  6. Greenhouse Gases - MIT Climate Portal

    Greenhouse gases are gases—like carbon dioxide (CO 2), methane, and nitrous oxide—that keep the Earth warmer than it would be without them. The reason they warm the Earth has to do with the way …

  7. Welcome — U.S. Greenhouse Gas Center

    Exploring Greenhouse Gas Data; Driving Sustainable Strategies through Powerful Analysis

  8. Greenhouse gases - U.S. Energy Information Administration (EIA)

    Many of the chemical compounds in the earth's atmosphere act as greenhouse gases. When sunlight strikes the earth's surface, some of it radiates back toward space as infrared radiation (heat).

  9. Greenhouse Gases Factsheet - Center for Sustainable Systems

    Greenhouse gases (GHGs) in the atmosphere prevent some of this heat from escaping into space, instead reflecting the energy back to further warm the surface. 1 The greenhouse effect was first …

  10. Greenhouse Gas (GHG) Emissions and Removals | US EPA

    Nov 12, 2025 · Learn about the most important GHGs. Where do GHGs come from? Learn about the human activities that add GHGs to our atmosphere. Find out more about global greenhouse gas …