Image via Uber Boston

On Wednesday, April 22, Uber will be offering rides in eco-friendly vehicles in observation of Earth Day. Between 7 a.m. and 7 p.m. the car-summoning service will allow users to call upon new hybrid and electric cars.

“This Earth Day we’re challenging you to #DitchYourKeys to help curb pollution and keep beautiful New England a healthy place to live, work, and play,” wrote Uber on its Boston blog. “There are many alternative transportation options available, and we’re adding a special one for Earth Day.”

Riders need only request UberGREEN and a vehicle that leaves behind a minimal carbon footprint will be curbside for you in a matter of minutes. UberX rates still apply.

It’s unclear what the make and model of Uber’s electric and hybrid cars are and how many will be made available in Boston. The image above suggests there are several, but Uber’s been known to offer promotional gimmicks like this before with a lacking number of viable vehicles. When delivering ice cream and even flu shots, for example, the “no cars available” message was frequent and Uber wouldn’t provide specific numbers.

They’ve also delivered chowder, gourmet meals, and on occasion Christmas trees.

But Uber is rolling out UberGreen all over the world which should be consolation enough for Bostonians who aren’t able to ride in one, knowing full well that at least Uber’s environmental campaign extends beyond the United States.

“With growing traffic congestion and fewer parking options, it’s time to get out of personal vehicles and start using the awesome alternative transportation options available,” Uber urged further on its blog. “Help the planet, travel smart and leave the keys at home.”

If you’re interested in living Earth Day to the fullest, though, ridesharing is one option but it’s probably most effective utilizing public transportation and even walking or biking.

But don’t take my advice for it. Also Wednesday afternoon, at 3 p.m., Mayor Marty Walsh is hosting a Twitter Q&A along with his environment and energy chief, Austin Blackmon, so you’ll have social media access to the city’s leaders and the opportunity to talk about best Earth Day practices with them.