Green and cool roofs provide relief for hot cities, but should be sited carefully
Reflective roof and skylights on a Walmart store, Las Vegas, [[https://www.flickr.com/photos/walmartcorporate/5258813444/in/photolist-91GN2j-pZvRkP-pX9GX1-nPuXYF-o8YWLQ-qqQck2-3PsWU3-qew5h8-4w8vDK-b8vDB4-8v2NEB-SQzgP-8ZnrEa-bFaukG-9C39Lv-qevS4a-DiPF6-5EvzYy-pX92h9-bU5eKz-bU5nQk-4pLmWH-8WcnfE-bU5eUx-pBZqkg-e3xcLw-b853gx-e3wQay-eTTGLF-91GN1W-qEZkn9-qqQdJ4-nve4Wj-bU5fQB-bU5n92-bFaFVQ-bFaxqG-bU5nw6-bU54Er-bU5mJ8-o16xq-phGRFh-bU5h1g-92QXmd-bU51qn-bU5rHv-bU5f9M-pBwpy4-bU56DR-xKdnj NV. Walmart/Flickr]], [[http://creativecommons.org/licenses/by/4.0/ CC BY]]</span>More than half of the world's population lives in cities, and the United Nations projects that this share will rise to 70 percent by 2050. During the daytime, these expanding urban areas absorb more solar energy than the surrounding countryside. At night they radiate the heat back to the atmosphere. Higher temperatures in cities compared to the areas around them create what are known as urban heat islands (UHIs).
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