A new study released Tuesday concludes that if the rooftops of the world's 100 largest cities were painted white it could significantly cool the atmosphere.
"According to Hashem Akbari, a physicist with the Lawrence Berkeley National Laboratory, a 1,000-square-foot roof -- the average size on an American home -- offsets 10 metric tons of planet-heating carbon dioxide emissions in the atmosphere if dark-colored shingles or coatings are replaced with white material.
Globally, roofs account for 25% of the surface of most cities, and pavement accounts for about 35%. If all were switched to reflective material in 100 major urban areas, it would offset 44 metric gigatons of greenhouse gases, which have been trapping heat in the atmosphere and altering the climate on a potentially dangerous scale.
That is more than all the countries on Earth emit in a single year. And, with global climate negotiators focused on limiting a rapid increase in emissions, installing cool roofs and pavements would offset more than 10 years of emissions growth, even without slashing industrial pollution."
FULL STORY: To slow global warming, install white roofs

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Planetizen Federal Action Tracker
A weekly monitor of how Trump’s orders and actions are impacting planners and planning in America.

San Francisco Suspends Traffic Calming Amidst Record Deaths
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A developer is reimagining a strip mall property as a mixed-use complex with housing and retail.

Study: Anti-Homelessness Laws Don’t Work
Research shows that punitive measures that criminalized unhoused people don’t help reduce homelessness.

In U.S., Urban Gondolas Face Uphill Battle
Cities in Latin America and Europe have embraced aerial transitways — AKA gondolas — as sustainable, convenient urban transport, especially in tricky geographies. American cities have yet to catch up.
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