Having visited Oxfam-funded school programs in rural communities has made me realise how vital education is to developing countries in bringing people out of poverty and giving them a sense of dignity, self-worth and confidence.

I campaigned for [Barack] Obama for more than a year. I was in Iowa, Minnesota, California, Arizona - just traveling around to help get the word out. It was such a huge, spirited campaign, and so positive. But you travel around to cities in the U.S. now and there's just this hopelessness that has set in. It makes it hard to understand why it seems so impossible to make any kind of progressive change with an administration that is seemingly progressive, or why we keep encountering such political roadblocks to change.

Obviously filming and working has consistently been a part of my life. I've never had a huge break of time when I wasn't working on something or promoting something.

I think it's important for people to be aware of the impact that climate change is having on this huge community of people.

Whenever I'm taking time off, all I'm thinking about is working.

I don't profess to know how to balance the positive and the negative media attention. It's a gamble every time you put yourself out there, and, certainly, I'm always readjusting to it.

I don't go to McDonald's anymore. After I saw Super Size Me... no way!