Climate change is the world's greatest environmental challenge. It is now plain that the emission of greenhouse gases, associated with industrialization and economic growth...is causing global warming at a rate that is unsustainable.

All new schools...should be models for sustainable development: showing every child in the classroom and the playground how smart building and energy use can help tackle global warming...Sustainable development will not just be a subject in the classroom: it will be in its bricks and mortar and the way the school uses and even generates its own power.

It's not that tens of millions of people all want to be violent. But they share the worldview that then, at its extreme, gives rise to the violence. And in my view, this is why this is such a global problem.

One of the things that I've been doing over the past few years is reevaluating my own powers of political analysis.

Yes, I feel I've got something to say. If people want to listen, that's great, and if they don't, that's their choice.

You know, one of the things I've learnt since coming out of office is how much easier it is to give the advice than take the decision. I mean, you know, it's tough.

We know the problems, and we know the solution: sustainable development. The issue is the political will.