Climate Change: Atmospheric Carbon Dioxide | NOAA …
2018-7-26 · Climate Change: Atmospheric Carbon Dioxide. Author: Rebecca Lindsey. August 1, 2018. The global average atmospheric carbon dioxide in 2017 was 405.0 parts per million (ppm for short), with a range of uncertainty of plus or minus 0.1 ppm. Carbon dioxide levels today are higher than at any point in at least the past 800,000 years.