A popular television commercial from the 1970s shows a Native American man in buckskin and feathers paddling his canoe through ink-black waters, past refineries billowing smoke. He comes aground on a litter-strewn shoreline and finds a freeway clogged with cars and exhaust fumes. Someone chucks fast-food garbage out a car window and it splatters onto his moccasins. The camera zooms in on a single tear streaming down his cheek, while the voiceover tells us "People start pollution. People can stop it."