The data for CO2 emissions can be used as is from the CDIAC data set. For data before 1751 a flat emission curve was assumed, as the emissions and emission changes were trivial compared to modern times.For life expectancy a historic world average of 27 years was estimated from historical estimates, as well as a world average of 31 years for the year 1900. Linear interpolation has been used to fill data gaps until the year 1960. From 1960 to the present annual global average values can be used as is from World Bank. The result is an “edge” in the graph where historical estimates connect with modern data, but a significantly lower historic life expectancy, while possible, seems implausible. This should be considered a “good case” average, although volatility was probably high during that time period. GDP per person and population values can be used as is from the Angus Maddison Project, which estimates historic data for both values. The population data after 1959 have been obtained from World Bank to include the most recent years. Slight discrepancies exist for overlapping time periods between the two data sets.