Jason Momoa is determined to "fight for our planet".

The 44-year-old actor - who hosts a new travel docuseries called 'On the Roam' - has revealed that if he hadn't become an actor, he would've gladly become a politician in a bid to help save the planet.

The Hollywood star said on 'PEOPLE in 10': "I’d wanna do something to help the environment.

"The way the world’s going, I would've, if I was still young Jason, 12-year-old Jason, I'd probably try to do something to get into politics, really fight for our planet.

"If I could go back and be in sixth grade, I would make my life go towards making a change."

Jason also observed that little lifestyle changes can actually make a significant difference to the environment.

He said: "I would just start in the home. Like, what are the small things you can do on how to save energy? What are we taking in that we can consider, ‘Do we need that?’"

'On the Roam' sees Jason travel around the US to visit different craftsmen, who explain how various items - including century-old bikes and choppers - are made.

The movie star previously revealed that he shocked some local people by appearing in their towns and cities to shoot the docuseries.

He told 'Entertainment Tonight': "I'm always in these weird places. You're gonna find me on the road. It happens all the time. They're like, 'What the hell are you doing in our hometown?'

"I love the idea of just being with everyday people and doing my craft, which is filming, and then showing them. And so, I think through doing that for so long, I got to be curious about it."