![The roof of the 12-story Chicago City Hall building has been retrofitted with a 22,000 square-foot rooftop garden to reduce urban air temperature. | Credit: Katrin Scholz-Barth The roof of the 12-story Chicago City Hall building has been retrofitted with a 22,000 square-foot rooftop garden to reduce urban air temperature. | Credit: Katrin Scholz-Barth](https://webarchive.library.unt.edu/web/20130216113019im_/http://www.doe.gov/sites/prod/files/styles/topic_hero/public/StateLocal.jpg)
The roof of the 12-story Chicago City Hall building has been retrofitted with a 22,000 square-foot rooftop garden to reduce urban air temperature. | Credit: Katrin Scholz-Barth
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