What’s litter? Litter is anything that is not properly disposed of in a trash can. On the side of Texas roadways, there are over 400 million pieces of visible litter! You probably did not even realize that there is that much litter, but 71 percent of litter consists of micro-litter. Micro-litter is defined as microscale debris, which can be apple cores, cigarette butts, gum wrappers, etc.