Keeling Curve

The Keeling Curve is a daily record of global atmospheric carbon dioxide concentration maintained by Scripps Institution of Oceanography at UC San Diego.

Scientists have long been studying how greenhouse gas pollution is changing the planet’s climate by closely tracking levels of CO2 in the atmosphere. Scripps geophysicist Charles David Keeling first started CO2measurements at NOAA’s weather station on Mauna Loa in 1958.

The concentration of CO2 in the atmosphere is increases every year at an accelerating rate. The early years at Mauna Loa saw annual increases averaging about 0.7 parts per million (ppm) per year, increasing to about 1.6 ppm per year in the 1980s and 1.5 ppm per year in the 1990s. The rate rose to 2.2 ppm per year during the last decade. 400 parts per million (ppm) has long been considered by scientists to be symbolic of a clear red line being passed into a danger zone of climate change, with this monthly CO2 value first been breached in 2014.

With the highest levels of CO2 being recorded, we must act now to reverse the trend. One such action is to rapidly decrease CO2 emissions from fossil fuels by scaling up renewable energy production.

To see the latest CO2 reading and to read more about the Keeling Curve visit: