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People who
in Thai national parks may get a
in their mail - their litter may be returned to
. Thailand decided to act on the increasing
of wrappers, plastic
and paper thrown away in national parks. It asked park
to mail litter back to tourists. Litterbugs get a
saying: "We collected your garbage...and sent it to your
. This should be a lesson...to never
throw away waste." People can also get a $16,000
.