“If the climate deniers were to succeed, and stopped the world responding to the mountain of evidence for human-induced global warming, then hundreds of millions of mostly impoverished people around the world would die from the effects of climate change….

If, like me, you adopt a virtue or duty ethic, but one tempered by consideration of the consequences of an act, climate deniers are less immoral that Holocaust deniers, although they are undoubtedly more dangerous.

However, as the casualties from a warming world mount over the next decades, the denialism of those who continue to reject the scientific evidence will come to be seen as more and more iniquitous.

So the answer to the question of whether climate denialism is morally worse than Holocaust denialism is no, at least, not yet.”
Clive Hamilton, “Denying the coming holocaust” Crikey.com, 16 November 2009