"Figure 1. Global Greenhouse Gas Emissions by Gas, 1990-2015",,,, Source: EPA's Climate Change Indicators in the United States: www.epa.gov/climate-indicators,,,, "Data source: Climate Watch, 2024",,,, Web update: December 2024,,,, Units: million metric tons CO2e,,,, ,,,, Year,Carbon dioxide,Methane,Nitrous oxide,"HFCs, PFCs, and SF6" 1990,23060.38,7002.92,2369.51,302.21 1995,24086.41,7095.62,2470.91,329.36 2000,25923.86,7171.95,2472.06,443.72 2005,29908.23,7637.59,2702.93,541.91 2010,33521.99,7930.31,2855.38,762.28 2015,34686.31,8314.76,2991.77,1000.64