Unfortunately, Iains, people DO dispute the real and imminent threat of climate change, including very powerful people who have a vested interest in our continuing to burn fossil fuels. They now have a very powerful politician backing them. The science is not settled, not now nor will it be in the future. The deniers latch on to the inevitable imprecisions in the scientific picture, as vested interests always tend to do. They are extremely dangerous people and we can fight them only with cool, calm, collected, measured, well-presented science. What we don't need is popular science scaremongering, which leaves us all the more open to ridicule and dimissiveness.