If the scientific evidence for manmade global warming is so compelling, why do so many people still have their doubts?
Why do politicians and the media often discuss global warming with such certainty, ignoring the scientists' carefully worded caveats?
And how much harder will it be to persuade the sceptics after the uproar over whether scientists exaggerated unreliable evidence or colluded to withhold information to strengthen their case?
Those tricky questions were raised at a sometimes fractious news conference in London to discuss the future of climate science.
Three leading British scientists told reporters the science behind anthropogenic global warming was "overwhelming", but admitted they are struggling to get their message across to a sometimes doubtful public.