Climate change deniers may be slotted into either of two categories. Whether fossil fuel executives, fossil fuel workers, PR people, lobbyists or members of Congress, they all fit in either one category or the other.

One consists of those who actually believe, against the vast preponderance of the peer-reviewed scientific evidence, that humans are not driving climate change. The remainder say what they will, careless or regardless of the facts because they have a personal interest in the outcome of the anti-global warming effort.

The former can be forgiven their ignorance or their self-delusion. But the latter are subversives who ought to be treated accordingly. By their intentional interference in the public discourse, they subvert the democratic process – which depends profoundly upon the truth. Their disrespect for fundamental democratic principals betrays their true colours, which are neither red nor blue but the colour of money.

The devastation to which these people have already committed us exceeds by far all danger we will ever experience from terrorism or dreaded immorality.