Although it's a tiny part of the market, green homebuilding has risen 50% since 2004.

According McGraw-Hill Construction market research, the residential green building market will be worth $12 billion to $20 billion (6-10% of the market) this year. By 2012, the market is expected to double. But who's to say what a "green" home means?

PMeditor Steve Smith sorts through the basics of two green programs and other initiatives.

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