"Environmentalists consider litter a nasty side effect of our convenience-oriented disposable culture. Just to highlight the scope of the problem, California alone spends $28 million a year cleaning up and removing litter along its roadways. And once trash gets free, wind and weather move it from streets and highways to parks and waterways. One study found that 18 percent of litter ends up in rivers, streams and oceans." (Quoted from article)