Perhaps the name refers to the green roof program the city of Chicago has been undertaking to lower urban heat. In the past decade over 200 green roofs (roofs converted or constructed to be like yards or gardens) have been built around Chicago, making it the city with the most green roofs in the U.S. The city government has been a major support in this program, transforming several public buildings’ roofs into gardens and yards including the block-large city hall. Traditional concrete or asphalt roofs trap heat contributing to urban warming, so by replacing conventional roofs with green roofs, city temperatures are lowered.
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