I take a bit of issue at his swipe 'if you can afford them'. Since the price is falling fast enough that electric cars should be actually cheaper than gasoline ones within a few years. Which means we might end up with more electric cars than we would gasoline ones. So yeah some of the negative externalies are fixed, CO2 emissions and air pollution. But others are not, traffic fatalities and injuries, traffic congestion, industrial pollution, resource depletion. And low prices may mean more of the latter not less.