Jenna Ladd |November 1, 2017
The average accumulated CO2 level in Earth’s atmosphere reached 403.3 parts per million last year, thanks to human activity and an El Niño weather event which brought drought to much of the world’s CO2-capturing vegetation. Last year’s increase of CO2 levels was 50 percent higher than average year-to-year increases over the last ten years.
Carbon dioxide and other greenhouse gas measurements were taken by the World Meteorological Organization (WMO) at 51 sites around the globe. Dr. Oksana Tarasova, head of WMO’s global atmosphere watch program, told the BBC, “It is the largest increase we have ever seen in the 30 years we have had this network.”
Tarasova also pointed out that while humans have slowed their greenhouse gas emissions, the cumulative excess CO2 already in the atmosphere will remain problematic for centuries to come.
Scientists say that Earth has not had the same concentrations of CO2 in the atmosphere since about three to five million years ago, when temperatures were two to three degrees Celsius warmer and sea levels were several dozen feet higher.
WMO Secretary-General Petteri Taalas said that urgent and drastic cuts to greenhouse gas emissions should be made to avoid “dangerous temperature increases” by 2100.
Taalas added, “With levels of carbon dioxide in the atmosphere consistently breaking new records, the influence of human activities on the climate system has become more and more evident.”