Climate Change
Greenhouse Gas Emissions
Overview of Greenhouse Gases
What are the main greenhouse gases?
Learn about the four most important greenhouse gases-carbon dioxide, methane, nitrous oxide, and fluorinated gases-and options for reducing emissions.
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Sources of Greenhouse Gas Emissions
Where do greenhouse gases come from?
Learn about the main human activities that add greenhouse gases to our atmosphere and opportunities to reduce emissions from these sources.
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To learn more about how greenhouse gas emissions contribute to warming, what were natural and human sources of greenhouse gas emissions in the past, and why greenhouse gases are building up in the atmosphere now, visit the Causes of Climate Change page in the Science section.
Greenhouse Gas Emissions Data
Information and data about greenhouse gas emissions are available at the global, national, facility, and individual levels.
National
Review EPA's Inventory of U.S. Greenhouse Gas Emissions and Sinks report, which contains annual estimates of greenhouse gas emissions and removals associated with human activities, for each year since 1990.
Facility
Explore facility-level greenhouse gas data collected through EPA's Greenhouse Gas Reporting Program data. You can view emissions from individual facilities or from many facilities organized by sector or state.
Individual
Use EPA's Individual Greenhouse Gas Emissions Calculator to estimate your carbon footprint.