Green Facts

27 million

Number of Chinese homes that get their hot water from rooftop solar water heaters


Percent of Iceland’s homes heated with geothermal energy


Increase, per square foot, in the value of residential units surrounding Chicago’s Millennium Park since it opened in 2004


Times more runoff generated by a typical city block than a woodland area the same size

Sources: Earth Policy Institute; “The Economic Benefits of Parks and Open Space,” report by Erica Gies; Environmental Protection Agency