https://www.americanprogress.org/issues/green/report/2015/04/30/112212/the-buildings-of-tomorrow-are-here-today/
"Net-zero energy buildings are technically and financially viable today and are delivering benefits to their owners and users. Throughout the United States, private citizens and businesses are already demonstrating this by building and retrofitting spaces of the future that are highly efficient and renewable energy powered"
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