The language 'It's too late' is very unsuitable for most environmental issues. It's too late for the dodo and for people who've starved to death already, but it's not too late to prevent an even bigger crisis. The sooner we act on the environment, the better.

Remember that history always repeats itself. Every great bubble in history has broken. There are no exceptions.

Libertarians believe that any government interference is bad. Anyone with a brain knows that climate change needs governmental leadership, and they can smell this is bad news for their philosophy. Their ideology is so strongly held that, remarkably, it's overcoming the facts.

I find the parallels between how some investors refuse to recognise the trends and our reaction to some of our environmental challenges very powerful. There is an unwillingness to process unpleasant data.