"The challenge will enable leading innovators and entrepreneurs with financial, technical, and expert resources to fast-track global solutions, help get those solutions to shelf, through the recovery system and back into the supply chain," Rob Kaplan, managing director of Closed Loop Partners, said in a statement. The idea behind the challenge is that any winning concepts would be used at Starbucks' stores. But Starbucks says in the release that "the solution will be open source so others can benefit and innovate on the path towards the development of recyclable and compostable cups around the world." In other words, they'll share.