Within certain limits we can say express strong opinions and not worry too much about the consequences.

But what if you express an opinion which appears to go against the prevailing wisdom? What you risk then is ridicule.

In Stop the World, the writer Kamran Nazeer talks to three people who hold views which make a lot people angry.

In part one, his subject is the Liberal Democrat peer, Dick Taverne.

In part two we hear from the broadcaster David Cox who believes cutting carbon emissions is not the way to tackle global warming. He criticises environmentalists for demanding that individuals make huge sacrifices for future generations.

Human beings, he says, just aren't programmed to respond to these sorts of pleas.