If electric cars really are the future, where is all the electricity to power them going to come from?
There are currently more than a billion vehicles on the road worldwide, 38 million of them registered in the UK. The overwhelming majority run on petrol or diesel.
But the world is changing.
Manufacturers are investing heavily in developing both hybrid and pure electric models to help meet tightening emissions standards.
But will this be a sustainable system in the future? This BBC article provides some good insights on the issue, don't miss it!