Carbon Dioxide Marches On June 21, 2017 By EarthWise https://earthwiseradio.org/wp-content/uploads/2017/06/EW-06-21-17-Carbon-Dioxide-Marches-On.mp3 The end of 2013 marked the first occasional observations of carbon dioxide levels in the atmosphere of 400 parts per million. There is nothing magical about that value, but we do tend to focus on round numbers. [Read more…] about Carbon Dioxide Marches On
