San Francisco named 'Greenest city in US'

SAN FRANCISCO

The survey was commissioned by Siemens, a global healthcare and energy company. It ranked 27 major cities in several areas including energy, transportation and waste.

San Francisco ranked first overall because of strong showings in just about every category, especially in waste, because of mandatory composting and recycling. The survey also praised the city's extensive public transportation system.

The other cities in the top five were Vancouver, New York City, Seattle and Denver.

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