The second, called electrochromic, requires voltage to switch the transparency from clear to opaque.
FORBES: Dynamic Windows Improve Efficiency, Human Experience in Buildings
Electrochromic glass, with changeable opacity, is one new avenue of exploration.
ECONOMIST: Green homes
John Van Dine, Sage's founder, says his company is about to invest in a new production facility that should reduce costs enough to make electrochromic windows competitive for homes by 2010.
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