Electric cars don't pollute, but they still have an environmental impact, because our electricity is mostly generated from fossil fuels.
Right now, 1kW-hour of power from a 240v socket produces about 0.47kg of CO2. Even so, all seven cars here are far greener than any production petrol or diesel car.
The future is even brighter because, as we get more power from nuclear or renewable sources (sun, wind, tides and so on), the environmental impact of EVs will fall further.
The Government has already promised to build thousands more wind turbines across the UK and up to seven million new solar roof panels.