Emissions of Greenhouse Gases in the United States 1997 - Table 2. Global Natural and Anthropogenic Sources and Absorption of Greenhouse Gases, 1992

Table 2. Global Natural and Anthropogenic Sources and Absorption of Greenhouse Gases, 1992

Gas	Sources		Absorption	Annual Increase in Gas in the Atmosphere
Gas	Natural	Human-Made	Absorption	Annual Increase in Gas in the Atmosphere
Carbon Dioxide (Million Metric Tons of Carbon)	150,000	7,100	154,000	3,100-3,500
Methane (Million Metric Tons of Gas)	110-210	300-450	460-660	35-40
Nitrous Oxide (Million Metric Tons of Gas)	6-12	4-8	10-17	3-5
Source: Summarized from ranges appearing in Intergovernmental Panel on Climate Change, Climate Change 1995: The Science of Climate Change (Cambridge, UK: Cambridge University Press, 1996), pp. 17-19.