Click here to download a printable version The greenhouse effect is a natural phenomenon that insulates the Earth from the cold of space. As incoming
solar radiation is absorbed and re-emitted back from the Earth’s surface as infrared energy, 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. Anthropogenic (human-caused) GHG emissions are modifying the Earth’s energy balance between incoming solar radiation and the heat released back into space, amplifying the greenhouse effect and resulting in climate change.1 Greenhouse Gases
Atmospheric Greenhouse Gas Emissions
Sources of Greenhouse Gas Emissions
Emissions and TrendsGlobal
United States
Emissions by ActivityFuture Scenarios and Targets
1 Teragram (Tg) = 1000 Giga grams (Gg) = 1 million metric tons = 0.001 Giga tons (Gt) = 2.2 billion pounds (lbs) Cite As Center for Sustainable Systems, University of Michigan. 2021. "Greenhouse Gases Factsheet." Pub. No. CSS05-21. References
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