This document discusses zero and positive net energy communities. It notes that carbon dioxide levels are rising at about 2 ppm per year and that, according to NASA scientist Dr. Hansen, carbon dioxide levels need to be reduced to 350 ppm to restore the Earth's energy balance. The document then provides examples of zero energy homes and communities that have been built, including a custom home in Westborough, MA that generates more electricity annually than it uses and a proposed 24-unit pocket neighborhood in Harvard, MA. Renderings and details of projects are shown.