At a lake in the West Javan city of Bogor, children and teenagers paddle toward piles of floating trash, pick it up and store it in their kayaks, before passing it to friends sorting it onshore.
The group of around 20 youngsters started off as a team of one, a decade ago, when Giri Marhara decided to start cleaning up the lake. He was just 16 years old at the time, and already had a penchant for wanting to clean up his environment — from his classroom to his neighborhood.
