Why cities need to be efficient

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Four numbers define the importance of cities, according to the co-chair of the Global Future Council on Cities and Urbanization.

These are 2, 50, 75, and 80, Carlo Ratti, director of MIT’s Senseable City Laboratory, said in his interview with the World Economic Forum (WEF).

“Cities occupy 2 percent of the world’s surface, but they are host up to 50 percent of the world’s population, are responsible for 75 percent of global energy consumption and 80 percent of CO2 emissions. Hence, if we made our cities just a little more efficient, we could have a major global impact,” Ratti explained in an article posted at the WEF website.
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