Rising Atmospheric Carbon Dioxide

Atmospheric Carbon Dioxide

In August of this year the monthly average of atmospheric carbon dioxide as measured at Mauna Loa was 409.95 parts per million, an increase of 3 parts per million in the past twelve months. In 1992 the concentration was 367 parts per million. In 1950 it was 310 ppm.

Mauna Loa is a good place to get accurate CO2 measurements; It is 3,400 meters high in the middle of the ocean, so it can sample an air mass that has already been fully mixed from the inputs and outputs of CO2 far below its summit and far away from it. It is surrounded by many miles of bare lava, helping to eliminate variations in the measurement from the respiration of vegetation.

The wheels of climate change throughout history have ground slowly, but those wheels are beginning to turn more rapidly now, as humanity increases its numbers, its industrialisation and its emissions.