World’s Longest Climate Record at Risk as US Plans to Defund Mauna Loa Observatory

The Mauna Loa Observatory in Hawaii, home to the world’s longest continuous record of atmospheric carbon dioxide, is facing an uncertain future. As part of proposed budget cuts by the Trump administration for the fiscal year 2026, the US National Oceanic and Atmospheric Administration (NOAA) may be forced to halt critical climate monitoring operations at the site. With the lease on a supporting laboratory in Hilo set to expire in August, the scientific community is raising alarm over the potential loss of one of the planet’s most vital climate monitoring efforts.

For over six decades, Mauna Loa has played a pivotal role in monitoring humanity’s impact on the atmosphere. Its data, captured in the iconic Keeling Curve, has provided irrefutable evidence of rising carbon dioxide levels due to fossil fuel emissions. Now, with funding and staffing in question, the continuity of this historic dataset hangs in the balance.

The Keeling Curve: A Lifeline of Climate Data

Since 1958, the Mauna Loa Observatory has been recording daily measurements of atmospheric carbon dioxide, which form the basis of the Keeling Curve, a crucial visual representation of how human activity is altering the Earth’s atmosphere. Located high on the remote slopes of Mauna Loa volcano, the observatory is uniquely positioned to collect clean, reliable air samples away from local pollution sources.

The Keeling Curve has tracked the rise in CO2 levels from around 315 parts per million (ppm) in the late 1950s. In 2024, the concentration had increased to 424.61 ppm, marking the first time that monthly average CO₂ levels at Mauna Loa surpassed 430 ppm this year. These measurements have not only helped to confirm the link between fossil fuel burning and climate change but have also been central to global policy and scientific assessments. Scientists warn that disrupting this record could impair our understanding of long-term climate trends.

Budget Cuts Threaten Core Monitoring Operations

The Trump administration’s proposed budget includes sweeping cuts to NOAA’s Office of Oceanic and Atmospheric Research, which oversees the Hilo lab that supports Mauna Loa’s operations. With the lease on the Hilo facility set to expire at the end of August, NOAA has not been allocated the necessary funds to renew it or relocate the equipment. This puts the continuity of the Mauna Loa program in jeopardy.

In addition to the lease issues, a wave of staff buyouts and reduced resources has significantly impacted NOAA. The agency has already seen a reduction in personnel critical to running greenhouse gas monitoring programs. Without renewed funding or intervention, it may become impossible to maintain the infrastructure needed to keep the CO₂ record uninterrupted.

Scientific Community Warns of Data Disruption

Experts worldwide have expressed concern about the potential impact of shutting down or pausing operations at Mauna Loa. Ralph Keeling, who leads the CO₂ program at the Scripps Institution of Oceanography, said the situation is deeply worrying, noting that even short gaps in the record could hinder climate research and policy tracking. The consistency of Mauna Loa’s data is unmatched, and replication elsewhere is not readily achievable.

While other observatories exist, such as Australia’s Cape Grim, they are not positioned to replace Mauna Loa’s unique data stream fully. Losing this observatory would not only impact the US but also global climate science, as many international research bodies rely on its readings to calibrate satellite measurements and assess global emission trends.

Global Impact and Urgent Calls for Action

The Mauna Loa CO₂ record has been a cornerstone in understanding how quickly the planet is warming and what role human emissions play. If the observatory’s operations are halted, the effects would ripple across the scientific community, affecting research accuracy, emissions tracking, and climate accountability.

Lawmakers and scientists are calling for the federal government to reconsider the budget proposal and take immediate action to secure the observatory’s future. For many, the threat to Mauna Loa is emblematic of a broader retreat from science at a time when reliable climate data is more critical than ever. As the planet continues to warm, ensuring the survival of trusted monitoring systems like Mauna Loa is crucial for informed decision-making and public awareness.

References:

https://www.commerce.gov/sites/default/files/2025-06/NOAA-FY2026-Congressional-Budget-Submission.pdf

https://www.acs.org/education/whatischemistry/landmarks/keeling-curve.html

https://edition.cnn.com/2025/07/01/climate/trump-cuts-mauna-loa-keeling

https://www.cbsnews.com/news/ralph-keeling-co2-data-collection-noaa-trump-cuts

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Photo by Peter Luo on Unsplash

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