Originally published by Bloomberg. A mix of high-tech and old-fashioned energy efficiency tactics can deliver carbon-neutral buildings, right now. But the U.S. needs to pick up the pace.

In saving energy, “there are no silver bullets,” says Richard Maimon, a partner at Philadelphia’s KieranTimberlake Architects. But neither is any moonshot needed. Efficiency-oriented tech tools — sensors, controls, and advanced energy modeling — are multiplying, and many tactics await only economies of scale to ease wide adoption.

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