In the US, coal, the dirtiest of fossil fuels, provides 50% of electricity, with all fossil fuels fuels providing 72%. Globally, coal provides 40% and all fossil fuels around 66% of the world's electrical power.
This reality suggest that we should first green the grid, then plug into it for transportation and other energy needs.
(Click the image to go to the original website and see a clearer image. It is also, of course, a vivid record of population, wealth, and probably other distributions.)
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