
Charles David Keeling began the analysis of carbon dioxide concentration in 1958 at the Mauna Loa Observatory, Hawaii.

After decades of monitoring, the results are shown in a graph called the Keeling Curve. It is the strongest evidence of human activity on the global climate.
The Observatory is connected to the world's most important Climate Monitoring networks.

The Sir Crispin Tickell High Altitude Global Climate Watch, located in Pico de Orizaba National Park in Puebla, Mexico, is the world's highest observatory at 4,581 meters above sea level, surpassing Mauna Loa in Hawaii, which reaches 4,100 meters.

Together with the Large Millimeter Telescope of the Institute of Astrophysics, Optics and Electronics, the Sir Crispin Tickell Climate Observatory make up the most important high-altitude scientific cluster in Mexico and Latin America.

The Observatory monitors the concentrations of the main Greenhouse Gases (GHGs): methane, carbon dioxide, nitrous oxide and chlorofluorocarbons; ozone, particulate matter and ultraviolet solar radiation on a regional and global scale.

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