Sustainable buildings and designs created significant buzz this year, and 14 buildings are among the "most mindblowing structures" of 2012, writes Morgan Clendaniel. Among them are the CO2ngress Gateway Towers project in Chicago "that scrubs the air clean;" prefabricated housing in California; and the first-ever net-zero stadium project in Brazil. Each highlights the growing adoption of sustainable construction to save on energy and resources.

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