SACRAMENTO, Calif. — Gov. Jerry Brown outlined a $2.5 billion plan Friday to help Californians buy electric vehicles and expand a network of charging stations as part of a goal of getting 5 million zero-emission cars on the road by 2030.

The ambitious proposal to transform California’s car culture comes as Brown begins his final year in office and works to set the stage for his environmental legacy to continue under his successor. The Democratic governor has positioned California as a global leader in fighting climate change amid President Donald Trump’s decision to pull the U.S. out of the Paris climate accord.

The number of zero-emission cars is a significant expansion of Brown’s goal of selling 1.5 million such vehicles by 2025. It’s a nearly 15-fold increase over the 350,000 zero-emission vehicles already on California’s roads. The $2.5 billion in spending still needs legislative approval.

Reaching the goal will require that 40 percent of vehicles sold in 2030 be clean, said Mary Nichols, chairwoman of the California Air Resources Board.