Comment by seanp2k2

Also, electric cars still run on fossil fuels since most of our energy production relies on coal / natural gas, though renewable energy is growing.

Major energy sources and percent share of total U.S. electricity generation in 2014:

Coal = 39% Natural gas = 27% Nuclear = 19% Hydropower = 6% Other renewables = 7% Biomass = 1.7% Geothermal = 0.4% Solar = 0.4% Wind = 4.4% Petroleum = 1% Other gases < 1%

( https://www.eia.gov/tools/faqs/faq.cfm?id=427&t=3 )