The EPA’s report on municipal solid waste (MSW) generation in 2009 says that 243 million tons of MSW were generated in the United States that year (US Environmental Protection Agency). Figure 3 shows the distribution of waste materials that make up the total weight. The three largest contributors; paper and paperboard, food scraps, and yard trimmings; are three common waste products of professional sporting events. The annual forty percent waste reductions projected for each stadium would total 109,648 tons, making a yearly decrease equal to .045 percent of all MSW.
McIntire, Jeff. "Colorado Rockies Score With Solar Power." Treehugger.com 9 April 2007.