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2000 Years of Greenhouse Gas Concentrations
Increases in concentrations of these gases since 1750 are due to human activities in the industrial era. Concentration units are parts per million (ppm) or parts per billion (ppb), indicating the number of molecules of the greenhouse gas per million or billion molecules of air. Image References: Forster et al.1; Blasing2
References
- 1. [3] Forster, P., V. Ramaswamy, P. Artaxo, T. Berntsen, R. A. Betts, D. W. Fahey, J. Haywood, J. Lean, D. C. Lowe, G. Myhre et al. "Changes in Atmospheric Constituents and in Radiative Forcing." In Climate Change 2007: The Physical Basis, edited by S. Solomon, D. Qin, M. Manning, Z. Chen, M. Marquis, K. B. Averyt, M. Tignor and H. L. Miller, 129-234. Vol. Contribution of Working Group I to the Fourth Assessment Report of the Intergovernmental Panel on Climate Change. Cambridge, UK and New York, NY: Cambridge University Press, 2007.
- 2. [7] Blasing, T. J.. Recent Greenhouse Gas Concentrations., 2008.
Summary
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