Comments not related to oil, natural gas, or coal should be to this post.
Edited 11/24/16 11:36 AM EST
Based on the recent work by Steve Mohr et al published in 2015, I have updated my estimate of potential future fossil fuel resouces.
Using the following estimates of Carbon emissions in Gt (or Pg) of carbon per billion tonnes of oil equivalent (Gtoe) burned:
coal=1.058 Gt C/Gtoe
natural gas=0.5935 Gt C/Gtoe
oil=0.7846 Gt C/Gtoe
The fossil fuel estimates were converted to Gt of carbon emissions, 200 Gt of carbon emissions were added to each scenario to account for land use change, cement production and natural gas flaring from 1750-2500 CE. The emissions resulting from the various fossil fuel scenarios presented in an earlier post at compared with RCP4.5, RCP6, and RCP8.5 used in the IPCC AR5 report to compare climate models under future emissions scenarios.
In the Mohr et al 2015 paper they conclude:
A plausible upper limit on fossil fuel emissions would be the medium emissions (A1 AIM and RCP6.0)with a BG future emissions corresponding to low emissions scenarios(B1 IMAGE and RCP4.5).
The RCP scenarios were modified slightly so that they follow the downward trend in emissions to zero, the original scenarios keep emissions at a level that keeps radiative forcing at about 8.5 W/m^2. 6 W/m^2, and 4.5 W/m^2 until 2500. The DC-high scenario also assumes a linear reduction in fossil fuel output from 2150 to 2250 in the scenario below.
Total C emissions in Gt C from 1750 to 2250 are: 5300, 2300, 1200, and 1700 for the modified RCP8.5, RCP6, RCP4.5, and DC-high presented in the chart below.