For the first time, the monthly average of carbon dioxide in the atmosphere has surpassed 430 parts per million at the Mauna Loa Observatory in Hawaii. The May 2025 number is higher than it's ever been in human history.
Scientists from the National Oceanic and Atmospheric Administration and the Scripps Institution of Oceanography at the University of California, San Diego have been taking daily CO2 measurements from the Mauna Loa site since 1974.
The increasing amount of carbon dioxide in our planet's atmosphere has altered the planet's weather patterns and intensified the frequency and severity of extreme events, such as heat waves, droughts, wildfires, heavy rainfall and flooding, according to the Intergovernmental Panel on Climate Change.
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