In 2016, the global total primary energy consumption was 526 quads. Of that total primary energy, 33% was oil, 24% was natural gas, and 28% was coal. (a) The carbon intensity of each fuel is below. Calculate 2016 global CO2 emissions from these three main fossil fuels in gigatons (Gt). Natural gas: 13.8 gC/MJ Oil: 19.7 gC/MJ Coal: 24.2 gC/MJ (b) If 40% of the CO2 emitted in 2016 of the CO2 emitted by from combustion of these three fossil fuels remains in the atmosphere and is well-mixed, what would be the corresponding increase in atmospheric CO2 ppmv? (The total mass of the atmosphere is 5.12 × 1021 g and its basic composition is 78% N2, 21% O2, 1%Ar