The greenest house in the world is in San Francisco, according to this CNET article. No, it isn't a verdant color; rather it has a net zero power consumption from the grid. Sixty percent of its power comes from photo voltaic panels on its roof. The remaining forty percent comes from a wind turbine in its yard.
The rain water is collected and used for laundry and toilets. All grey water, except the used toilet water, is recycled on the property. Used toilet water apparently gets flushed to the city's system.
There are many other features that awed San Francisco Mayer, Gavin Newsom in this video of his tour of the property.
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