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Over 90 percent of the fuel used for transportation is petroleum based, which includes primarily gasoline and diesel. Greenhouse gas emissions from transportation primarily come from burning fossil fuel for our cars, trucks, ships, trains, and planes. Transportation (29 percent of 2019 greenhouse gas emissions) – The transportation sector generates the largest share of greenhouse gas emissions. This annual report estimates the total national greenhouse gas emissions and removals associated with human activities across the United States.The primary sources of greenhouse gas emissions in the United States are:
Commercial and Residential (13 percent of 2019 greenhouse gas emissions) – Greenhouse gas emissions from businesses and homes arise primarily from fossil fuels burned for heat, the use of certain products that contain greenhouse gases, and the handling of waste. Industry (23 percent of 2019 greenhouse gas emissions) – Greenhouse gas emissions from industry primarily come from burning fossil fuels for energy, as well as greenhouse gas emissions from certain chemical reactions necessary to produce goods from raw materials. Approximately 62 percent of our electricity comes from burning fossil fuels, mostly coal and natural gas.
The decrease was primarily in CO 2 emissions from fossil fuel combustion which was a result of multiple factors, including a decrease in total energy use and a continued shift from coal to less carbon intensive natural gas and renewables.The Electricity sector involves the generation, transmission, and distribution of electricity. Greenhouse gas emissions decreased compared to 2018 levels. From year to year, emissions can rise and fall due to changes in the economy, the price of fuel, and other factors. Greenhouse gas emissions have increased by 2 percent. In the United States, since 1990, managed forests and other lands are a net sink, i.e., they have absorbed more CO 2 from the atmosphere than they emit.Since 1990, gross U.S. Land Use and Forestry (12 percent of 2019 greenhouse gas emissions) – Land areas can act as a sink (absorbing CO 2 from the atmosphere) or a source of greenhouse gas emissions.
Natural gas use accounted for 37 percent of electricity generation in 2019, and petroleum use accounted for less than one percent. Although coal use accounted for about 61 percent of CO 2 emissions from the sector, it represented only 24 percent of the electricity generated in the United States in 2019. Less than 1 percent of greenhouse gas emissions from the sector come from sulfur hexafluoride (SF 6), an insulating chemical used in electricity transmission and distribution equipment.Greenhouse Gas Emissions in the Electricity Sector by Fuel SourceCoal combustion is more carbon intensive than burning natural gas or petroleum for electricity. These gases are released during the combustion of fossil fuels, such as coal, oil, and natural gas, to produce electricity.
Therefore, it is possible to attribute the greenhouse gas emissions from electricity generation to the sectors that use the electricity. Greenhouse Gas Emissions and Sinks: 1990–2019.Electricity is used by other sectors—in homes, businesses, and factories. Greenhouse gas emissions from electricity have decreased by about 12 percent since 1990 due to a shift in generation to lower- and non-emitting sources of electricity generation and an increase in end-use energy efficiency.Percentages may not add up to 100% due to independent rounding.All emission estimates from the Inventory of U.S. Greenhouse gas emissions, accounting for 25 percent of the U.S. Emissions and TrendsIn 2019, the electricity sector was the second largest source of U.S. 1 Most of these non-fossil sources, such as nuclear, hydroelectric, wind, and solar, are non-emitting.
Shifting dispatch of electric generators to lower-emitting units or power plants.Using renewable energy sources rather than fossil fuel to generate electricity.Increasing the share of total electricity generated from wind, solar, hydro, and geothermal sources, as well as certain biofuel sources, through the addition of new renewable energy generating capacity.Reducing electricity use and peak demand by increasing energy efficiency and conservation in homes, businesses, and industry.EPA's ENERGY STAR® partners avoided over 330 million metric tons of greenhouse gases in 2018 alone, helped Americans save over $35 billion in energy costs, and reduced electricity use by 430 billion kWh.Generating electricity from nuclear energy rather than the combustion of fossil fuels.Extending the life of existing nuclear plants and building new nuclear generating capacity.Capturing CO 2 as a byproduct of fossil fuel combustion before it enters the atmosphere, transporting the CO 2, injecting the CO 2 deep underground at a carefully selected and suitable subsurface geologic formation where it is securely stored.Capturing CO 2 from the stacks of a coal-fired power plant and then transferring the CO 2 via pipeline, injecting the CO 2 deep underground at a carefully selected and suitable nearby abandoned oil field where it is securely stored. Converting a single-cycle gas turbine into a combined-cycle turbine. Converting a coal-fired boiler to use of natural gas, or co-firing natural gas. 2 Example Reduction Opportunities for the Electricity Sector TypeIncreased Efficiency of Fossil-fired Power Plants and Fuel SwitchingIncreasing the efficiency of existing fossil fuel-fired power plants by using advanced technologies substituting less carbon-intensive fuels shifting generation from higher-emitting to lower-emitting power plants.
Cambridge University Press, Cambridge, United Kingdom and New York, NY, USA. Contribution of Working Group III to the Fifth Assessment Report of the Intergovernmental Panel on Climate Change. Climate Change 2014: Mitigation of Climate Change (PDF) (1454 pp, 50MB). Electricity Explained - Basics.
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