Actress and activist Jane Fonda on Friday announced that she is backing Sen. Bernie Sanders Bernie SandersMcConnell accuses Democrats of sowing division by 'downplaying progress' on election security The Hill's Campaign Report: Arizona shifts towards Biden | Biden prepares for drive-in town hall | New Biden ad targets Latino voters Why Democrats must confront extreme left wing incitement to violence MORE (I-Vt.) in the White House race, citing his plans to tackle climate change.

“We have to get a climate president in office, and there’s only one right now, and that’s Bernie Sanders,” Fonda told USA Today. “So, I’m indirectly saying I believe you have to support the climate candidate.”

Fonda has emerged as an outspoken advocate of efforts to combat climate change, making appearances at weekly protests in Washington that often ended in her arrest.

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Climate change is one of the top issues in the primary race, which has now narrowed to Sanders and former Vice President Joe Biden Joe BidenCast of 'Parks and Rec' reunite for virtual town hall to address Wisconsin voters Biden says Trump should step down over coronavirus response Biden tells CNN town hall that he has benefited from white privilege MORE as the top main candidates.

The Vermont lawmaker in August put out a sweeping climate plan that calls for the transition to relying solely on renewable energy for electricity and transportation by 2030 and complete decarbonization by 2050. To push the transition forward, the proposal would create 20 million “good paying, union jobs” in several fields, including steel and auto manufacturing, construction, energy efficiency retrofitting and sustainable agriculture.

“This is a pivotal moment in the history of America, and really, in the history of humanity," Sanders said at the time. "The climate crisis is not only the single greatest challenge facing our country; it is also our single greatest opportunity to build a more just and equitable future, but we must act immediately."