Metro riders hopping off at Capitol South and Union Station received a surprise on Tuesday - free chocolate bars. On this Earth Day, Metro and the American Public Transportation Association teamed up to give out the bars. Metro says it's a reward for saving 20 pounds of carbon emissions by riding public transportation on Earth Day. The transit agency says if just one person in a household switches from driving to using public transportation, the household's carbon footprint can be reduced by 10 percent. If a household gives up its second car altogether, a household can reduce carbon emissions up to 30 percent. Information from: WTOP-FM
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