For the first time ever, carbon dioxide levels have exceeded 430 parts per million (ppm) at their seasonal peak, according to researchers from the National Oceanic and Atmospheric Administration (NOAA) and the Scripps Institution of Oceanography.
Data from the Mauna Loa Observatory, a key global site for monitoring atmospheric CO₂, recorded a monthly average of 430.2 ppm in May 2025—an increase of 3.5 ppm compared to May of the previous year. Similarly, NOAA’s Global Monitoring Laboratory reported a 3.6 ppm rise over the same period.
“Another year, another record,” said Ralph Keeling, director of the Scripps CO₂ Program. “It’s disheartening.”
Historic Observatory Behind the Keeling Curve
Located on the slopes of Hawaii’s Mauna Loa volcano, the observatory has been monitoring CO₂ levels since 1958, when scientist Charles David Keeling first documented seasonal patterns and long-term increases in atmospheric carbon dioxide. His work led to the development of the Keeling Curve, a foundational climate science record.
NOAA joined the monitoring efforts in 1974, providing an independent source of daily CO₂ data. Although events like the 2022 eruption of Mauna Loa temporarily disrupted observations, scientists quickly adapted by using backup systems and alternative sites, such as Maunakea, to continue data collection.
Atmospheric carbon dioxide has now reached its highest level in recorded human history.
The Primary Driver of Climate Change and Ocean Acidification
As the most impactful greenhouse gas caused by human activity, CO₂ acts like a heat-trapping blanket around the Earth, intensifying extreme weather events such as heatwaves, droughts, wildfires, and floods. It also drives ocean acidification, which threatens marine species like corals, crustaceans, and shellfish.
While Mauna Loa offers a key reference point, CO₂ concentrations vary around the globe—stations in the Southern Hemisphere, for instance, haven’t yet hit 430 ppm due to different seasonal patterns. To better understand global trends, NOAA operates an extensive sampling network, and Scripps maintains 14 international monitoring stations, helping identify where CO₂ is emitted and absorbed—from forests to oceans.
The continued rise in CO₂ is a stark signal for researchers and decision-makers alike. The Global Greenhouse Gas Reference Network, which includes data from Mauna Loa, remains an essential resource in climate science, guiding global efforts to reduce emissions.
With backing from the National Science Foundation, Schmidt Sciences, and Earth Networks, scientists are expanding CO₂ monitoring capabilities—because recognizing the scale of the issue is a vital first step toward meaningful climate action.
Read the original article on: TechXplore
Read more: Miracle Powder Removes CO2 from the Air More Effectively than Any Other Solution