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As of 2024, the carbon dioxide concentration in Earth’s atmosphere was 424.6 ppm, a jump of more than 50% from levels before our species began relying on fossil fuels less than three centuries ago.

By contrast, the earlier Eocene, when C02 reached 1000 ppm and the global mean temperatures were 13º C warmer than today, could represent the worst case scenario.

As of 2024, the carbon dioxide concentration in Earth’s atmosphere was 424.6 ppm, a jump of more than 50% from levels before our species began relying on fossil fuels less than three centuries earlier.

Measurements taken at the Mauna Loa Observatory in Hawaii indicate that CO2 levels are currently around 423 ppm.

As it entered the tube, the Berkeley air contained CO2 in concentrations ranging from 410 ppm to 517 ppm.