We should look at how "the enemy" - people that you wouldn't necessarily agree with - have done change and see whether there's bits in there that we could learn from.

I sound like a church nut, but look at the role of the churches in the civil rights movement in the States. People are brought together in other ways that can become drivers of change.

Floundering around, learning by doing but also by failing, is not only good but inevitable.

I see [activists] getting really angry that people won't just do what the evidence tells them, and that's not very helpful. You need to actually think why that is.

I have to be sure of myself - in a conditional way, always being open to the possibility that I'm wrong.

People are saying, "I have a right to my opinion. Don't just keep condescending, telling me what to think." There's something slightly liberating about that, but also it lends itself to being taken advantage of, because in come the demagogues.

There are always pressures on decision-makers other than just what is right or what is wrong.