City of Toronto Green RoofsGreen Roofs for Healthy CitiesPennsylvania State University Green Roof ResearchGreen Roof Research at Michigan State UniversityCity of Chicago Green RoofsCity of Portland EcoroofsU.S. Environmental Protection Agency Green Roof Research Project Studies Stormwater AbsorbencyNational Research Council Institute for Research in Construction. Publications related to rooftop gardensGreenroofs.com Research LinksRe-greening Washington, DC: A Green Roof Vision Based on Quantifying Storm Water and Air Quality BenefitsNorth Carolina State University’s Biological and Agricultural Engineering Department Green Roof ResearchEarth Pledge Green Roofs InitiativeUniversity of Georgia Institute of Ecology River Basin Centre: Green RoofsCity of Waterloo: Green Roofs Feasibility Study and City Wide Implementation Plan