There is scarcely a discussion of climate change on the radio or television which does not involve a"climate sceptic": someone who believes there is no problem. This would be unexceptionable if themedia always promoted dissent: if, for example, someone was brought in to attack capitalism every time theeconomy was discussed. But the coverage the anti-environmentalists receive suggests that the dissent whichreinforces an underlying orthodoxy is welcome, while that which challenges it is not. Whatever the explanationmay be, the airtime their views receive is out of all proportion to the scientific support they muster.