There are a few problems yet to be solved. First, the battery system in a Tesla Model S has a carbon footprint from manufacturing that equals driving a midsize

There are a few problems yet to be solved. First, the battery system in a Tesla Model S has a carbon footprint from manufacturing that equals driving a midsized gasoline powered car for 8 years. If that doesn't change, then there is no net carbon reductions Second, battery energy density needs to get dramatically better. Current Li-Ion batteries are about 6 times the energy density of a lead-acid battery of 40 years ago. They need to get 20 times better to equal a hydrocarbon fuel. Third, the increase in electricity demand has to come from somewhere. It isn't viable to replace all electricity generation with wind/solar, without MASSIVE storage investment. Hydroelectric and nuclear will be needed at large scale to cover this demand if coal and gas are not used. While everyone talks about these technologies getting better at the same rate computers did, they haven't thus far. They might, but the laws of thermodynamics are a steep slope.