Climate activist and actor Jane Fonda says the nation faces an “existential” choice in November, and she’s throwing her support behind President Joe Biden.

“Who wins in November is going to determine whether we have a livable future. It’s as simple as that, and there’s a very stark choice,” she told CNN’s Wolf Blitzer on Tuesday. “It’s not that I’m 100% happy with President Biden, but he’s someone that we can work with, that American people can work with.”

“Because I think that this election is so important, it’s existential, I decided that I was going to throw in with the campaign,” she added.

The “Grace and Frankie” star has been stumping for Biden in what she says is the first time she’s actively campaigned for a presidential candidate in her many years of activism.

She told Blitzer that if the “orange man is elected,” he has already indicated his openness to rolling back climate regulations. She pointed to reporting last month that the presumptive GOP nominee asked oil industry executives to donate $1 billion to his campaign in exchange for regulatory favors.

“And that’s why I really want to elect Joe Biden, because we’re running out of time,” she said. “I have grandchildren. I won’t be around to see the worst of it. But we have to confront the climate crisis, and we have to do it fast.”

Fonda has a decades-long history of activism, supporting feminist, civil rights and anti-war causes. More recently, she’s been focussed on tackling the climate crisis. In 2019, she spent her 82nd birthday in jail after she was arrested at a climate protest in Washington, D.C.

Watch the interview below.