Environmental Building News (where I work) reported on photoluminescent exit signs in 2006. With tens of millions of exit signs deployed in North America that use up to 350 kWh each annually (as much as a nicely efficient refrigerator), it's a big deal.

Light is one of our most important energy needs. Historically--before the advent of electric lighting--the need for illumination governed architecture. Buildings were designed to facilitate natural daylighting. My office is in one of the old Estey Organ buildings on Birge Street, built in the late 1800s; it's just 28 feet wide, allowing natural light from the windows to reach fully into the building.

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Greenbuild 2008 included the first ever Green Homebuilder's Day, a conference within the much larger overall conference. Homebuilder's Day welcomed old hands and newcomers to the field of green building, and the sessions were full. BuildingGreen organized the event, which coincided with the announcement of our soon-to-be-available, residentially oriented Green Building Advisor. That this day of educational sessions took place at all is a good sign for the future of houses in America and for softening their environmental impact.

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