Mexico City Roof Gardens Take Root to Combat Smog
Roof gardens absorb heat building by building - boosting energy efficiency and reducing greenhouse gas emissions. (CNN)
MEXICO CITY - In one of the world's biggest and most polluted cities, rooftop gardens are springing up in an effort to battle the smog, part of an initiative driven by the city's government.
It aims to combat the pollution of nearly five million cars.
"We know green roofs are also beneficial to capture heavy metals, particles, which is an important part of air quality. And obviously there is a reduction in the maintenance costs of the buildings because you don't have to waterproof the green roofs every two to three years," said Tanya Miller, environment secretary of Mexico City.
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