For years China was the world’s top destination for recyclable trash, but a ban on certain imports has left nations scrambling to find new dumping grounds for growing piles of garbage. The decision was announced in July and came into force on January 1, giving companies from Europe to the United States barely six months to look for other options, and forcing some to store rubbish in parking lots. In China, some recycling companies have had to lay off staff or shut down due to the lost business.