Harrison Ford has blasted US President Donald Trump for attacking science and supporting fossil fuels.

The Indiana Jones star - a longtime environmental advocate - told The Guardian: "[Donald Trump] doesn't have any policies, he has whims. It scares the s*** out of me.

"The ignorance, the hubris, the lies, the perfidy. [Trump] knows better, but he's an instrument of the status quo, and he's making money, hand over fist, while the world goes to hell in a handbasket.

"It's unbelievable. I don't know of a greater criminal in history."

President Trump began his second term in office in January, and he has already cut funding for clean energy projects, encouraged the use of fossil fuels, fired hundreds of scientists while deleting their work, and banned his government from mentioning "climate change" and "emissions".

He has also shared his dislike for wind turbines, which Harrison said was because "he has just not seen a gold one".

The actor - who owns a carbon-emitting private jet - said President Trump's climate crisis legacy would be "a clear expression of ignorance, of hubris and purposeful subterfuge".

The Air Force One star hoped President Trump's vision for a fossil-fuel-led future would not happen, with The Guardian pointing out that the world is "embracing cleaner forms of energy, albeit at a slower pace".

Harrison said: "He's losing ground because everything he says is a lie.

"I'm confident we can mitigate against [climate change], that we can buy time to change behaviours, to create new technologies, to concentrate more fully on implementation of those policies.

"But we have to develop the political will and intellectual sophistication to realize that we human beings are capable of change. We are incredibly adaptive, we are incredibly inventive. If we concentrate on a problem, we can fix it most times."

Harrison was forced to evacuate from his home in Brentwood, Los Angeles, due to the wildfires that engulfed parts of the Californian city.

And Harrison - whose home dodged destruction - had a feeling that the vast wildfires, caused by rising temperatures, were coming.

He explained: "I knew it was coming. I have been preaching this stuff for 30 years.

"Everything we've said about climate change has come true. Why is that not sufficient that it alarms people that they change behaviours? Because of the entrenched status quo."