Sometimes the failures can be exciting and fun. It's just a step on the road, it's not the end of something.

I'd been influenced by reading books on art and colonies that existed in Paris and places like that and so when I came to Europe I came to France and I had very little money, and I had to live low and stayed in a bohemian section of Paris with a lot of other students, who were from medical school, science school and art school. We all lived in a kind of communal way and I was challenged politically, because I didn't have a clue and they would ask me questions about the Algerian War, which was very big in France in the late '50s.

The way you really find out about the performer's seriousness about the cause is how long they stay with it when the spotlight gets turned off. You see a lot of celebrities switch gears. They go from the environment to animal rights to obesity or whatever. That I don't have a lot of respect for.

When people start thinking of you more as a persona, they are less inclined to allow you to move into different areas. Sometimes they're wrong. Sometimes they're just very stereotypical or restricted in their own thinking of what they'll allow you to do.

I was raised in California during the Second World War and into the '50s and everything was fine, everything was great. The sun always shone, everybody looked healthy and wore ties and smoked in restaurants, and there were cars for everybody - except us, because I came from a lower class neighbourhood. But [in France] I realised there was a different point of view, so when I came back to America a year and a half later I was much more focused on my own country culturally and politically.

Between 18 and 19 years old [in the 1950s] I came to Paris. I studied art. And that experience really did change my life. I was living hand to mouth. I walked everywhere. I thought, this city is incredible but you really have to experience it by walking it.

People are finally able to look around and say, 'I can see the drought, I can see the rising sea levels, I can see the crops dying. Okay, now I get it.' It is finally beginning to sink in that there has been a lot of damage.