Fig. 4

Global observed average temperature change relative to preindustrial levels. Dark shaded ranges show the effects of population growth on temperature change in the BAU and Alg-Feed+CCS scenarios. The lighter-shaded regions display the sensitivity of BAU results to alternative RCP scenarios and of Alg-Feed results to the biomass productivity of afforested land. For comparison to established emissions benchmarks, median IPCC temperature anomaly predictions in 2100 are shown at right with errors representing a 90 % confidence interval [1]. HadCRUT4 data are used for results validation, and represent observed temperature increases over preindustrial era from the Met Office Hadley Center