I think crime is a huge issue for people. If you were living in the poorest state, and you've got drug dealers at the end of the street, and your life's in misery, and you're afraid of your kids going out the door. I mean, the job of progressive politicians is to do something about that.

Global warming is too serious for the world any longer to ignore its danger or split into opposing factions on it.

I think Hillary Clinton is an outstandingly capable and decent person.

When my parents were growing up the world's population was under three billion. During my children's lifetime, it is likely to exceed nine billion. You don't need to be an expert to realise that sustainable development is going to become the greatest challenge we face this century

The moment you stigmatize a whole group of people - for example, Muslims - then, obviously, you make the decent, law-abiding Muslims feel as if they're under threat in some way or that their legitimacy, as members or citizens of society, is brought into question.

People divide into groups where they talk to each other, but don't talk across the divide. And yet most of the challenges we face in the world today are challenges that are to do with trade, with technology, with how you make sure that people are properly educated, reform your health care system.

There is good evidence that last year's European heat wave was influenced by global warming. It resulted in 26,000 premature deaths and cost $13.5bn.