Litter is gross. It’s also notably bad for the environment. And nothing says “we don’t care what you think about our city!” quite like block after block of garbage-laden sidewalks.

That’s why Philadelphians Dave Brindley and Yury Korzun have developed a new website called Not in Philly, with an assist from Pennsylvania Resources Council, Code for Philly and Think Brownstone (soon to be “Think Company“).

Put us in coach! https://t.co/M8QDlxeeGU

— Not in Philly (@NotinPhilly) December 20, 2016

But it’s more than a website. The group rewards citizens (and nonprofits and companies!) who make a six-month commitment to picking up litter on their site by doling out gifts from business sponsors such as Hub Bub Coffee.

Check out this writeup in Next City.

According to Brindley, over 100 people have signed up across the city. The site was built on volunteer power — Brindley told Next City he will begin looking to fund the project so he can expand it outside of Walnut Hill, the only neighborhood where it is “fully activated.”