The sidewalk retains stormwater from the street.
"Green Infrastructure" uses mother nature's original design to control some of the problems we humans create, from pollution-laden storm-water runoff to urban heat islands. The Environmental Protection Agency is gung-ho about it, but it hasn't taken the local streets by storm, yet. Environment reporter Sabri Ben-Achour visits a garden in Northeast D.C. to find out why.
[Music: "It's Not Easy Being Green" by Ray Charles from Hallelujah I Love Her So!]