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.

The Donald Trump phenomenon in the U.S. is mirrored completely by the Brexit phenomenon in the U.K. It's very similar forces. And what is interesting to me is there are two different groups that come together, who don't really agree with each other, but have come together in unity against, if you like, what is perceived as the status quo, or - and certainly what is a more center-right or center-left type of politics.

I'm afraid that's in the nature of modern politics - it's as much conducted by abuse as argument.

Make the wrong choices now and future generations will live with a changed climate, depleted resources and without the green space and biodiversity that contribute both to our standard of living and our quality of life

If I'd proposed solving the pension problem by compulsory euthanasia for every fifth pensioner I'd have got less trouble for it.

I think we've, again, got to be extremely careful; otherwise we'll misunderstand what's going on in Iraq and in Syria today. Of course, you can't say that those of us who removed Saddam in 2003 bear no responsibility for the situation in 2015.

What the commission that myself and Leon Panetta is trying to do is analyze this in two respects. First of all, what's the right military response and security response?