News > CO2 Reaches Symbolic 400ppm Threshold
Image: Indirect (proxy) measurements (Data source: Reconstruction from ice cores. Credit: NOAA)
CO2 is an important greenhouse gas, which is released through human activities such as burning fossil fuels and deforestation, as well as natural processes such as respiration and volcanic eruptions.
Since 1958, the Mauna Loa Observatory has been gathering data on how much CO2 is present in the atmosphere, with measurements indicating that CO2 has increased by around 24% since the beginning of this record.
Dr. Annmarie Eldering, NASA Deputy Project Scientist on the Orbiting Carbon Observatory-2 satellite mission said, “Reaching 400 ppm is a stark reminder that the world is still not on a track to limit CO2 emissions and therefore climate impacts. Passing this mark should motivate us to advocate for focused efforts to reduce emissions across the globe.”
In December this year, leaders from all nations of the world will meet in Paris for the UN Climate Change Conference with the objective to achieve a legally binding and universal agreement on climate.