A documentary about Atlanta’s tree canopy has caught the attention of lawmakers in Brookhaven, a metro Atlanta city that takes great measures to protect the environment through law and conservation. “The Tree Economy,” a film by James Schroeder, explores how urban planning has sped up the loss of trees in metro Atlanta, and what local experts think about the shrinking coverage. According to the USDA, even with 24 million acres of forest land, Ge…