January 25, 2013, 10am PST
When the new headquarters for the Bullitt Foundation opens this April in Seattle, it will be among the first to meet the Living Building Challenge - "the most stringent green standard around." But getting there isn't easy, and may be illegal.
April 22, 2012, 9am PDT
Greg Hanscom, senior editor at Grist, speaks with Denis Hayes, who coordinated the first Earth Day in 1970, when he was 25, about the big day, green building, and his prognosis for the planet.