Each week, Elisa Ng trawls the streets of Singapore picking up rubbish discarded by her fellow citizens. She is not searching for treasure hidden in the litter. Her only goal is to leave the city a little cleaner than before. "I want to encourage other people to pick up a piece of litter every day," she says. Recently, she chased an errant lorry driver who had thrown a plastic bag from his window. "He looked quite apprehensive and … [Read more...]