c123.
Spratt and Sutton (2008), pp vi and 27. For cumulative emissions (rather than timing), see Myles R. Allen, David J. Frame, Chris Huntingford, et al., “Warming Caused by Cumulative Carbon Emissions Editor’s note: For the latest data on atmospheric CO2 concentrations, plainly presented, see “Trends in Atmospheric Carbon Dioxide”, Earth System Research Laboratory Global Monitoring Division, available at www.esrl.noaa.gov/gmd/ccgg/trends/ . In 2015, the concentration is at around 400 ppm. Towards the Trillionth Tonne”, Nature, 458, 30 April 2009, pp 1163–1166.