"Here's what the green residential landscape looks like in the 21st century. In the United States, advances in green-building technologies have to compete with the proliferation of 3,000-square-foot-plus homes -- simultaneous trends that underscore one of the key paradoxes of sustainable development in the United States.

"In spite of everything we've done to make the building envelope more efficient," O'Brien said, "we're still using more energy in our homes." Nadav Malin, the editor of the monthly newsletter Environmental Building News, agrees. Most of the green features people are incorporating into their homes represent ecological improvements in the 10 to 50 percent range, he said via e-mail. But even a 50 percent reduction in the ecological footprint, Malin noted, "would be totally offset by a doubling of the house size."

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