 Since the 1970s, over 70 studies measuring littering, its contents and impacts on local and state governments, have taken place in both the United States and Canada, according to "Reducing Litter on Roadsides" by the Transportation Board of the National Research Academies.More recently, litter has been identified as a problem for storm water systems, prompting litter surveys to determine the characterization of storm water trash and the extent to which various components of litter contribute to this problem.The "Caught Doing Good!"