> CO2 in the atmosphere is getting very low (~0.2%). We are currently at about 400 ppm (parts-per-million), which would be 0.04%. http://co2now.org/ http://co2

> CO2 in the atmosphere is getting very low (~0.2%). We are currently at about 400 ppm (parts-per-million), which would be 0.04%. http://co2now.org/ http://co2now.org/ About 20 000 years ago, the lowest was maybe ca. 200 ppm.