On a trip to Costa Rica with his family in 2000, Ralph Groenheijde noticed his son wasn’t picking up shells from the sunkissed beaches, but colored bottle caps. He and his family used the collected caps to create a mosaic of the sun on the sand. Then, they immortalized it with a picture before cleaning up those caps for good. But this experience stuck with Ralph. He’d realized this extent of the planet’s litter problem and spent the next two years looking for ways to motivate people to pay attention and stop littering.