Using embankments, channels, and dikes, so-called “green roads” help control floods, harvest excess water for irrigation, and slash maintenance costs. A movement to retrofit existing roads is gathering steam. Using embankments, channels, and dikes, so-called “green roads” help control floods, harvest excess water for irrigation, and slash maintenance costs. A movement to retrofit existing roads is gathering steam. Read More Science, Science / Environment, Green Mile Wired