In addition to having the top overall score, San Francisco was among the five top scorers in six categories -- air, energy, buildings, transport, waste and water. Among the categories, San Francisco claimed the No. 1 spot in waste management having been the first U.S. city to require composting and recycling for residents, commercial properties, food establishments and events.
The report also praised the city for forging partnerships with the private sector to push green initiatives. Recent adoption of an ordinance requiring energy auditing of existing buildings is an example of how such relationships -- this case involved industry participants in a commercial building task force -- have produced results in San Francisco.
“It’s certainly an honor for San Francisco to be named the greenest city in North America, and it’s great to get recognition for the good work San Franciscans have done,” said Mayor Edwin M. Lee in a statement.
Siemens Corp. President and CEO Eric Spiegel said: "The Green City Index demonstrates that America's cities are the driving force behind the nation's sustainability efforts.
"Despite the fact that we do not have a federal climate policy in the United States -- and no federal carbon standard -- 21 of the 27 cities in the index have already set their own carbon reduction targets," Spiegel said in a statement released with the results. "Cities are creating comprehensive sustainability plans, utilizing current technology and proving everyday that we don't have to wait to create a more sustainable future."
The study findings were announced at the 2011 Aspen Ideas Festival. The full report is available for free download from Siemens.
Last week, San Francisco topped another green rankings list. The Green Building Opportunity Index, which is compiled by Cushman & Wakefield in collaboration with the Northwest Energy Efficiency Alliance’s BetterBricks initiative, named San Francisco No. 1 among the 30 largest office markets in the U.S. for a second consecutive year.
Image CC licensed by Flickr user huangjiahui.