Litter Picking Dog

In the 14th century, the rise of waste in Europe helped contribute to the bubonic plague. Black rats, carrying the fleas which were the vectors for the plague, fed off the food scraps. Many plagues were started from litter.
In addition to intentional littering, almost half of litter on U.S. roadways is now a result of accidental or unintentional litter, debris that falls off of improperly secured trash and recycling collection vehicles and pickup trucks. Heavy traffic and proximity to waste disposal sites are known to correlate with higher litter rates.
According to a study by the Dutch organisation VROM, 80% of the people claim that "everybody leaves of a piece of paper, tin or something, on the street behind". Young people from 12 to 24 years cause more litter than the average (Dutch or Belgian) person. But older people too cause litter. For example, 18% of people who regularly cause litter were 50 years of age or older. Nevertheless, automobile drivers and recreationalists, smokers and the youth are specific target groups within many campaigns conducted to keep countries free of litter.