Projected Global CO2 Concentration
Time series of global average atmospheric carbon dioxide concentration for specific emissions
pathways. The left panel shows the CMIP3 simulations for the SRES A2, A1B and B1 scenarios. The right
panel shows the CMIP5 simulations for the RCP8.5, 6.0, 4.5, and 2.6 scenarios. Figure source: Adapted from
Melillo et al. (2014).