Jim McMahon

The note on the box read, “You have forgotten some of your belongings at the Khao Yai National Park.” Inside: garbage the campers had left behind during an outdoor excursion. Thailand officials are growing concerned about the amount of trash in their national parks, so they’ve taken the unorthodox approach of mailing it back to litterers. And the measure doesn’t end there: Campers who violate park rules are reported to the police, and littering can result in a maximum of five years in prison and a fine of up to $16,000. The move comes amid growing global efforts to reduce pollution and protect wildlife. Thailand’s tactic of shaming individuals is more extreme than most, but officials say this strategy is necessary to preserve the land. “You may take only two things from our parks,” Thailand’s environment minister, Varawut Silpa-archa, wrote on Facebook. “Those are memories and photos. Leave only footprints behind.”