Too much plastic trash. Not enough resources to get out of poverty. Social entrepreneur David Katz looked at these two trends together and figured out a way to make them add up to opportunity, not despair. Last spring Katz and partner Shaun Frankson founded a company called Plastic Bank that plans to set up plastics recycling centers in developing areas around the world. Local community members will be encouraged to collect plastic trash and bring it to the centers, where they will be able to exchange it for basic necessities, the opportunity to use 3-D printers to create things they can use to set up their own enterprises, and more. Meanwhile, the plastic is recycled and waterways, beaches and roadsides are renewed. Katz and Frankson plan to open the first center in Lima this April, and have their eyes on establishing additional centers in Asia and Africa.