Scientists estimate that the remaining recoverable amount of fossil fuels (i.e., the "reserve") in the ground is 746 GtC (IPCC). If we burn fossil fuels at the 2015 rate (use value of 36.4 GT co2/yr) from now on, how long will the global fossil fuel reserve last? Hint: Be careful with your units and the difference in mass between C and CO2 throughout this question.