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Over the past 30 years, San Francisco has made impressive progress cleaning up its built environment. Since 1990, carbon emissions from the operation of buildings have dropped 51 percent. And between 2013 and 2018 — despite tremendous economic growth — energy use in commercial structures was reduced 11 percent. But with buildings still responsible for 2.2 million tons of greenhouse-gas emissions annually (about 44 percent of the citywide total), there is more work to do.
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