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

$100

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