As global warming threatens the future of our society, Jo Fidgen tackles the ways in which ordinary people can make a difference.

We're often told that we could help the environment by driving less, eating less meat, or using less water.

But in the face of a challenge as significant as global warming, how big a difference can small changes really make? And what would the world look like if we took those solutions to their logical extremes?

Cars are one of the climate's biggest problems, from burning petrol to the carbon cost of manufacture. But they've also revolutionised how we get around and embedded themselves in the way our cities and societies are designed. Can people really be convinced to cut down their time behind the wheel?

Producer: Robert Nicholson

A Whistledown production for BBC Radio 4