One World Record We Didn’t Want to Break
2018-05-16
This spring, the Mauna Loa Observatory in Hawaii recorded its first-ever CO2 reading in excess of 410 ppm. Many climate scientists now believe that CO2 levels are at a dangerously high level. When I first became involved with demand-controlled ventilation (DCV) a decade ago, background CO2 levels were well under 400 parts per million (ppm).