Arnold Schwarzenegger says leaders who claim combating climate change hurts the economy are “stupid or liars”.

Ahead of the COP26 climate summit, the former governor of California told the BBC that cutting carbon emissions will benefit global economies.

The Terminator actor said reducing meat intake does not have to mean sacrificing something – instead cutting his own has led him to be healthier.

He also aimed at the pollution caused by international trade.

In a wide-ranging interview for BBC Radio 4’s 39 Ways to Save the Planet series, Mr. Schwarzenegger claimed California’s continued economic success and prolific job creation prove carbon dioxide reduction and boosting wealth go hand in hand.

“They are liars, they are stupid. Or they don’t know how to do it, because we figured how to do it and it’s all about having the balls to do it,” he argued.

Mr. Schwarzenegger became a champion of clean air and renewable energy while governor between 2003 and 2011 – setting targets to reduce exhaust fumes and greenhouse gas emissions.

Arnold Schwarzenegger (left) has argued green policies will benefit economies around the world

Since leaving office he has used his fame and influence to promote carbon-cutting policies, notably with the Schwarzenegger Climate Initiative.

Mr. Schwarzenegger is also critical of an environmental agenda focused on lifestyle sacrifice.

The former champion bodybuilder says he has reduced his meat intake by around three-quarters in the last few years but argues he is “gaining” as a result.

“Since eating more vegetables and plant-based foods my heart doctor said my arteries have stopped narrowing,” he said.

“So how have I given up something? I gained my health, it gave me an extra two years.”

Mr. Schwarzenegger also believes technology is delivering solutions and cites his Hummer – a massive military-style off-road vehicle – that he switched from diesel to battery power as evidence, given the electric version goes faster with more horsepower.