Many rivers, sees and oceans are terribly polluted. John Kellett of Clearwater Mills has come up with a solar-powered trash-collecting barge that is essentially a giant conveyor belt that scoops up trash from waterways, and then deposits it in an onboard dumpster. The new trash collecting mechanism cleaned 46 metric tons of trash out of Baltimore’s harbor in a month, and could possibly remove up to 23 tons a day in more heavily polluted areas.