U.S. Environmental Protection Agency. (2018). Estimating the environmental effects of green roofs: A case study in Kansas City, Missouri. EPA 430-S-18-001.

Because of their many energy-saving and environmental benefits, green roofs are a promising technology for energy-efficient buildings. In a green roof, a layer of vegetation covers the surface of a roof to provide shade, cool indoor and outdoor temperatures, stormwater management, and more. The main components are waterproofing, soil, and plants.
Produced for the U.S. Department of Energy, Energy Efficiency and Renewable Energy, by the National Renewable Energy Laboratory. DOE/EE-0298. August 2004

NASA's Green Roof Fact Sheet, July 2012.

GSA, which currently maintains over 2 million square feet of green roofs, has a long history of constructing and maintaining successful green roofs, dating back to 1935. Information about GSA's green roofs can be found on the agency's Green Roof Tracker. More guidance and information about green roofs can be found using the link to the the Sustainable Facilities Tool website.

Green roofs have been proven to help reduce heat islands. This page provides a brief overview of the role of green roofs in mitigating the heat island effect, including green roof types, other environmental and social benefits, and cost-benefit considerations.
From the United States Environmental Protection Agency (EPA).

A Science Nation video, from the National Science Foundation. 2010.

The installation of green roofs on historic buildings helps to improve the energy efficiency of these buildings, makes them more environmentally beneficial to the community and building occupants, and allows the buildings to continue to serve a useful purpose while updating them for today’s environmental standards.
From the National Park Service (NPS).

Living Roofs and Walls: from policy to practice.10 years of urban greening in London and beyond.
published by the European Federation of Green Roof and Green Wall Associations (EFB) and Livingroofs.org on behalf of the Greater London Authority. 2019.

The City of Chicago's Green Roof dataset and corresponding map provides the location, satellite images, and square footage of existing green roofs within the City of Chicago.

The District of Columbia Department of Energy and Environment (DOEE) Watershed Protection Division implements projects that control, prevent, and provide remediation for sources of stormwater pollution to District of Columbia (District) waters and the Chesapeake Bay. One approach to managing stormwater runoff from rooftops is the low impact development technology called green roofs. Includes links to information on the Riversmart program and a n inventory of green roofs in the District of Coumbia.