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Tom Heap sets off on a guilt trip road trip to find out why people like him won't give up the things they know are destroying the planet.

Tom loves his powerful car. Despite a pretty thorough knowledge of the science of climate change and the contribution that his petrol-powered Subaru makes to a warming world he doesn't want to give it up. He's not alone. Most of us have dirty pleasures we have no intention of foregoing, whether that's eating meat, buying fast fashion or flying to our favourite holiday destinations.

So what will make Tom and people like him change their behaviour for the sake of the planet? Tom hits the road to find out, dropping in on people who have influenced his thinking on the environment. There's food writer and cook, Jack Monroe who has helped make veganism a pleasure rather than a pain. There's John Browne, the oil company CEO who tried to push BP, Beyond Petroleum, Christiana Figueres, the diplomat who persuaded Presidents and PMs to sign up to carbon reductions. And there's the Bishop of Salford who thinks we should heed the Gospels and accept that personal sacrifice is essential to save the world.

Producer: Alasdair Cross