What would happen if all coal consumption were to be replaced with natural gas?
In 2020 total emissions would be 5,110 MMt carbon dioxide, very close to the 2020 target. 2) By how much would renewables plus nuclear have to displace coal to reach the target? Answer: The target could be reached if coal consumption were reduced by about 42 percent, and the displaced 9.2 quads of energy were replaced by renewables plus nuclear, implying more than doubling of renewable plus nuclear energy supply, to comprise 30 percent of all energy consumption. If renewables alone (i.e., non-nuclear) are to carry the weight of displacing coal, then they would have to increase their role in consumption by a factor of 4.7 over 2007 values. If growth in renewable energy supply is restricted to solar and wind only, then these sources would have to increase their role in consumption by a factor of 80 (that is, e-i-g-h-t-y). The reason for this big difference is that biomass and geothermal provided about 6.4 quads of energy in 2007, whereas wind and solar only 0.4 quads. The Obama Administr
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