DONNEL BAIRD SAYS THE FIRST WAKE-UP CALL CAME when he was a little kid, living with his family in an unheated apartment in New York City. To get through a cold winter night, they turned on the gas oven to keep warm and then opened the windows so they wouldn’t suffocate.
There had to be a better way. The air at home was toxic, and—especially important to Baird today—all
