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Global Greenhouse Gas Emissions Data
May 8, 2015 – 03:09 pm
Pie chart that shows different sectors. 26 percent is from energy supply; 13 percent is from transport; 8 percent is from residential and commercial buildings; 19 percent is from industry; 14 percent is from agriculture; 17 percent is from forestry; and 3 percent is from waste and wastewater.

Global Emissions by Gas

At the global scale, the key greenhouse gases emitted by human activities are:

  • Carbon dioxide (CO2) - Fossil fuel use is the primary source of CO2. The way in which people use land is also an important source of CO2, especially when it involves deforestation. Land can also remove CO2 from the atmosphere through reforestation, improvement of soils, and other activities.
  • Methane (CH4) - Agricultural activities, waste management, and energy use all contribute to CH4 emissions.
  • Nitrous oxide (N2O) - Agricultural activities, such as fertilizer use, are the primary source of N2O emissions.
  • Fluorinated gases (F-gases) - Industrial processes, refrigeration, and the use of a variety of consumer products contribute to emissions of F-gases, which include hydrofluorocarbons (HFCs), perfluorocarbons (PFCs), and sulfur hexafluoride (SF6).

Black carbon (BC) is a solid particle or aerosol, not a gas, but it also contributes to warming of the atmosphere. Learn more about BC and climate change on our Causes of Climate Change page.

Global Greenhouse Gas Emissions by Source

Source: IPCC (2007);based on global emissions from 2004. Details about the sources included in these estimates can be found in the Contribution of Working Group I to the Fourth Assessment Report of the Intergovernmental Panel on Climate Change .

Global Emissions by Source

Global greenhouse gas emissions can also be broken down by the economic activities that lead to their production.

Line graph of global carbon dioxide emissions from fossil fuels for 1900 through 2008. The line graph shows a slow increase from about 2,500 teragrams of carbon dioxide emissions in 1900 to about 5,000 teragrams of carbon dioxide emissions in 1950. After 1950, the increase in carbon dioxide emissions is more rapid, reaching approximately 32,000 teragrams of carbon dioxide in 2008. Pie chart that shows country share of greenhouse gas emissions. 23 percent comes from China; 19 percent from the United States; 13 percent from the EU-27 (excluding Estonia, Latvia, and Lithuania); 6 percent from India; 6 percent from the Russian Federation; 4 percent from Japan; 2 percent from Canada; and 28 percent from other countries.
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