The 2009 Report of the German Advisory Council on Climate Change (WBGU, Wissenshaftlicher Beirat der Bundesregierung Globale Umweltveränderungen) was entitled “Solving the climate dilemma: the budget approach” and crucially stated: “The budget of CO2 emissions still available worldwide could be derived from the 2 degree C guard rail. By the middle of the 21st century a maximum of approximately 750 Gt CO2 (billion metric tons) may be released into the Earth’s atmosphere if the guard rail is to be adhered to with a probability of 67%. If we raise the probability to 75%, the cumulative emissions within this period would even have to remain below 600 Gt CO2. In any case, only a small amount of CO2 may be emitted worldwide after 2050. Thus, the era of an economy driven by fossil fuels will definitely have to come to an end within the first half of this century” (see WBGU, “Solving the climate dilemma: the budget approach”).
[Editor’s note: The US Energy Information Administration (US EIA) provides detailed statistics on CO2 pollution and has provided estimates of global energy-related CO2 pollution between 2005 (28.181 Gt CO2) and 2035 (43.220 Gt CO2) (see US EIA, “Energy-related carbon dioxide emissions”, Table A10). Using this expertly-determined, year-by-year estimate of global energy-related CO2 emissions one can estimate that the post-2009 total will reach 588 Gt by the end of 2026 and 628 Gt by the end of 2028 i.e. the terminal CO2 pollution budget will be exceeded in mid-2027 or in roughly 14.5 years from now.]