Littering articles are stories that discuss litter, a major pollution problem. To "litter" means "to throw things on the ground and leave them there", as opposed to disposing of them.
There are various types of litter, from throwing objects on the ground to improperly disposing of waste products. Those that litter may not realize or care that this pollution is detrimental to our environment. They may also not realize that litter can cause fatal car accidents. Litter exists in the environment for extremely long periods of time and affects our quality of life. The most widely littered item on our planet is cigarette butts, which take around 400 years to completely degrade.