Climate change is probably the greatest long-term challenge facing the human race.

The trouble is nowadays that parts of the media operate in a very partisan way. There's no point in complaining about it, that's the way it is. But let's be clear, a lot of it is driven by the views of a pretty small number of people, rather than a normal standard of journalism.

The great advantage of the Lib Dems is precisely that no-one knows what they stand for.

Anywhere, anytime ordinary people are given the chance to choose, the choice is the same: freedom, not tyranny; democracy, not dictatorship; the rule of law, not the rule of the secret police.

If you've got communities that feel they've been left behind, if you've got - as you do in Britain at the moment, you have communities that believe they're being changed by immigration, that they don't have job opportunities, and that they're disregarded and that they don't - they've got no stake in a future which embraces globalization, you've got to address that issue.

I've never ruled out the possibility of going back into public service.

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.