科研之友
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<正>People who litter in Thai national parks may get a surprise in their mail3—their litter may be send back to them. Thailand decided to act on the more and more wrappers4, plastic5 bottles and paper thrown away in national parks. It asked park workers to send litter back to tourists who littered. They get a letter saying:"We collected6your litter and sent it to your home. This should be a lesson to never again throw away waste."They can also get a$16,000 fine7.
