# IPCC, 2013: Climate Change 2013 -- Physical Science Basis.
# Annex II. Climate System Scenario Tables.
#   AII.4 Abundances of the Well-Mixed Greenhouse Gases
#     Table AII.4.1 CO2 abundance (ppm)
#     (p. 1422)
# Values of the year 2000 is added, based on
#   AII.1 Historical Climate System Data
#     Table AII.1.1.a Historical abundances of the Kyoto Greenhouse gases
#     (p. 1401)
year  RCP2.6  RCP4.5  RCP6.0  RCP8.5
2000  368.7   368.7   368.7   368.7
2010  389.3   389.1   389.1   389.3
2020  412.1   411.1   409.4   415.8
2030  430.8   435.0   428.9   448.8
2040  440.2   460.8   450.7   489.4
2050  442.7   486.5   477.7   540.5
2060  441.7   508.9   510.6   603.5
2070  437.5   524.3   549.8   677.1
2080  431.6   531.1   594.3   758.2
2090  426.0   533.7   635.6   844.8
2100  420.9   538.4   669.7   935.9