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Buildings account for nearly 40% of US carbon emissions. This means that low emission buildings must be part of our clean sustainable future. Initiatives such as Architecture 2030 and California’s Title 24 are not only helping to pave the way by creating a general framework for sustainable buildings but pushing the boundary with Net Zero Buildings (NZB’s) or Zero Energy Buildings (ZEB’s) that aim to almost completely offset a building’s adverse climate change impacts. These buildings will produce just as much energy as they consume and will be commonplace by 2020 and 2030.