Buildings generate approximately 40 percent of the United States' carbon emissions. Under a likely carbon-constrained future, the construction of more environmentally friendly buildings and the renovation of existing buildings will play a critical role in reducing these emissions. The green building market is growing dramatically. McGraw Hill estimates that the total value of green construction was $10 billion in 2005, and that value grew to between $36 and $49 billion by 2008. By 2013, it estimates that the market could grow to as much as $96–140 billion.



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