It's very hard to impose your beliefs or a specific message about any given movie. I think that audiences always extract what they want from a film even if something isn't overtly political. They may or may not get it, and it's hard to control that.

And now it's your turn - the time to answer the greatest challenge of our existence on this planet is now.

I suppose playing an older man is a way of preparing myself for getting older.

We only get one planet.

I've changed. You can't help it. Your mind starts working in a different way. You feel really scrutinised by people.

Sam [Mendes] said he took advantage of the fact that Kate and I were so close for many years. He knew it was something he could harness in our performances, and we knew that too.

When I was very young, biology, the diversity of life, was one of my main interests. I know there's this image people have that I'm this spoiled, cocky punk of an actor. Honestly, that's not who I am. I really care that so many species have been wiped out, like genocide of entire races. I believe in the divine right of all species to survive on this planet. So I decided I want to be active as an environmentalist. I learned. I asked experts. I got active.