Opposed to littering or designed to prevent and discourage the dropping of trash and garbage in public spaces.
From anti- (against) plus litter, from Middle English 'litere' (strewn about). The antilitter movement emerged strongly in the 1960s-70s with campaigns like 'Keep America Beautiful' as environmental consciousness grew.
The Native American 'Crying Indian' PSA from 1971 was one of history's most effective antilitter campaigns—but it was actually funded by beverage companies to deflect blame from corporate packaging to individual consumers, a PR move that worked brilliantly.
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