By Ken Haapala, President, Science and Environmental Policy Project
Brought to You by Swww.SEPP.org
0.04% NOT 0.4%: Last week’s TWTW contained a significant typo, which was caught by a number of readers. The current concentration of carbon dioxide (CO2) in the atmosphere is approximately 0.04%, not 0.4% as erroneously stated. This is based on measurements made at Mauna Loa, an observatory at 3402 m, or 11,200 feet above sea level on the island of Hawaii (the Big Island). The actual average for May was 414.7 parts per million (ppm). It declines as the summer season takes hold in the Northern Hemisphere and plants use photosynthesis to create food and oxygen from CO2 and water. In May 2018, the average was 411.2 ppm. TWTW appreciates those who corrected the typo and regrets any confusion the typo may have caused.