![]() ![]() greenhouse gas emissions were offset by net sinks resulting from land use and forestry practices (see Figure 2). Emissions sinks, the opposite of emissions sources, absorb carbon dioxide from the atmosphere.Transportation has been the largest sector since 2017. Transportation has historically been the second-largest sector, accounting for 26 percent of emissions since 1990 (see Figure 2). economy, electricity generation (power plants) accounts for the largest share of historical emissions-31 percent of total greenhouse gas emissions since 1990. However, the decline also reflects the combined impacts of long-term trends in many factors, including population, economic growth, energy markets, technological changes including energy efficiency, and the carbon intensity of energy fuel choices. This sharp decline is largely due to the impacts of the coronavirus (COVID-19) pandemic on travel and economic activity. greenhouse gas emissions decreased from 2019 to 2020 by 9 percent. Emissions of fluorinated gases (hydrofluorocarbons, perfluorocarbons, sulfur hexafluoride, and nitrogen trifluoride), released as a result of commercial, industrial, and household uses, increased by 90 percent.Nitrous oxide emissions, predominantly from agricultural soil management practices such as the use of nitrogen as a fertilizer, decreased by 5 percent.Methane emissions decreased by 17 percent, as reduced emissions from landfills, coal mines, and natural gas systems more than offset increases in emissions from activities such as livestock production.Emissions of carbon dioxide, the primary greenhouse gas emitted by human activities, decreased by 8 percent.For the United States, during the period from 1990 to 2020 (see Figure 1):.This total represents a 7 percent decrease since 1990 and a 20 percent decrease since 2005 (see Figure 1). greenhouse gas emissions totaled 5,981 million metric tons (13.2 trillion pounds) of carbon dioxide equivalents.
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