Contribution of Working Group I to the Fifth Assessment Report of the Intergovernmental Panel on Climate Change. Now everyone can fight climate change. The GWP values appearing in the Emissions webpages reflect the values used in the U.S. EPA has the following resources to manage these gases in the Industry sector: Sulfur hexafluoride is an extremely potent greenhouse gas that is used for several purposes when transmitting electricity through the power grid. Carbon dioxide emissions in the United States increased by about 5.8 percent between 1990 and 2018. For each greenhouse gas, a Global Warming Potential (GWP) has been calculated to reflect how long it remains in the atmosphere, on average, and how strongly it absorbs energy. Climate Change 2013: The Physical Science Basis Exit. In the United States, since 1990, the management of forests and other land (e.g., cropland, grasslands, etc.) Emissions can be reduced by reducing nitrogen-based fertilizer applications and applying these fertilizers more efficiently,3 as well as modifying a farm's manure management practices. For further discussion of GWPs and an estimate of GHG emissions using updated GWPs, see Annex 6 of the U.S. U.S. Environmental Protection Agency, Washington, DC, USA. Carbon dioxide is naturally present in the atmosphere as part of the Earth's carbon cycle (the natural circulation of carbon among the atmosphere, oceans, soil, plants, and animals). Chemical Formulas: Carbon dioxide is constantly being exchanged among the atmosphere, ocean, and land surface as it is both produced and absorbed by many microorganisms, plants, and animals. Learn more about the EPA's Natural Gas STAR Program and Coalbed Methane Outreach Program. The main human sources of GHG emissions are: fossil fuel use, deforestation, intensive livestock farming, use of synthetic fertilizers and industrial processes. SF6: 22,800. Upgrading the equipment used to produce, store, and transport oil and natural gas can reduce many of the leaks that contribute to CH4 emissions. Emissions of perfluorocarbons (PFCs) and sulfur hexafluoride (SF6) have actually declined during this time due to emission reduction efforts in the aluminum production industry (PFCs) and the electricity transmission and distribution industry (SF6). Source: Forcing greenhouse gases - Global emissions (2012), International Energy Agency. This section provides information on emissions and removals of the main greenhouse gases to and from the atmosphere. Cambridge, United Kingdom 996 pp.2IPCC (2013). Nitrous oxide emissions from mobile combustion decreased by 63.7 percent from 1990 to 2018 as a result of emission control standards for on-road vehicles. Climate Change 2013: The Physical Science Basis, Voluntary Aluminum Industrial Partnership, The PFC Reduction/Climate Partnership for the Semiconductor Industry, light-duty and heavy-duty vehicle standards, IPCC (2007) Climate Change 2007: The Physical Science Basis. Greenhouse gases are compounds that are able to trap heat in the atmosphere, these gases are the fundamental cause of the greenhouse effect. Empowering you to fight climate change! Between 1990 and 2018, the increase in CO2 emissions corresponded with increased energy use by an expanding economy and population, including overall growth in emissions from increased demand for travel. Note: All emission estimates from the Inventory of U.S. Greenhouse Gas Emissions and Sinks: 1990–2018. Forcing greenhouse gases take many years to leave the atmosphere. Share on Facebook"What are greenhouse gases?". HFCs: up to 270 years For comparison, a small car is likely to weigh a little more than 1 metric ton.