# IPCC, 2013: Climate Change 2013 -- Physical Science Basis.
#   Annex II. Climate System Scenario Tables.
#     AII.1 Historical Climate System Data
#       Table AII.1.1.a Historical abundances of the Kyoto Greenhouse gases
#       (p. 1401)
#year CO2conc(ppm)
1760  276.5
1770  277.3
1780  278.2
1790  280.0
1800  282.6
1810  284.2
1820  283.3
1830  283.8
1840  284.1
1850  286.8
1860  286.1
1870  288.0
1880  289.8
1890  293.1
1900  296.2
1910  299.3
1920  303.3
1930  306.6
1940  310.4
1950  311.2
1960  316.7
1970  324.6
1980  338.0
1990  353.6
2000  368.7