Global temperature change as a function of cumulative carbon emissions from various lines of evidence. (a) Simulated GHG-attributable warming as a function of cumulative emissions based on representative concentration pathway (RCP) and 1%·yr−1 CO2 increase (1PCT) simulations from the fifth phase of the Coupled Model Intercomparison Project (CMIP5) and Model for the Assessment of Greenhouse Gas Induced Climate Change (MAGICC) experiments. The MAGICC was used in order to compare the results of CMIP5 models used in IPCC Working Group 1 to the MAGICC model results in Working Group 3. (b) The ratio of GHG-attributable warming to cumulative carbon emissions (TCRE). The ranges of numbers in panel (b) indicate the amounts of cumulative emissions from the horizontal axis of (a) for each simulation. These values indicate different ratios of TCRE at different amounts of cumulative emissions from various RCP simulations.