Vacant urban lots have been linked to increased crime rates, drug use, and financial instability. These vacant lots, long viewed as a liability, in fact present a massive opportunity for carbon sequestration projects, rainwater filtration, habitat restoration, energy use reduction, and environmental education. By creating a series of grassroots movements in struggling urban areas, it is possible to inexpensively convert vacant urban lots into small patches of forest. These micro-forests will provide myriad economic benefits for urban communities at surprisingly little cost. In addition, the micro-forests will increase property values, reduce toxic runoff, provide habitat, and increase quality of life for residents. In this paper, I provide a simplified guide for the ecological revitalization of vacant urban lots. I reference my own research into vacant urban lots in Baltimore as an example.