Shuttle buses transport almost four million Yosemite visitors around the park.
The buses are diesel-electric, but now they are being replaced by cleaner zero-emission buses.
Yosemite has a fleet of almost 30 buses that take visitors from waterfalls in the valley to hiking trails.
They traveled almost a half-million miles last year, and now comes the next step to provide even cleaner transportation.
Ranger Scott Gediman says starting next year new all-electric buses will join the fleet.
“To be the first national park to have electric buses with zero emissions is very exciting. We’re going to start with two of the buses, and eventually replace the fleet with all buses like this,” Gediman said.
Gediman says the new buses will reduce greenhouse gas emissions by almost 900 thousand pounds a year and save about $150 thousand on maintenance and operating costs.