The ocean has spent three decades quietly absorbing over 90% of the excess heat humanity has pumped into the atmosphere, asking nothing in return. Now, according to a major new international climate report, it is running a fever, and the equipment we use to track how bad things are getting is being switched off. This is, to put it plainly, a terrible combination.
Triple the Heatwaves, Double the Denial
The numbers in this year's Indicators of Global Climate Change report are the kind that should stop a person mid-scroll. In 2025, the number of days of marine heatwaves was more than triple what it was in the early 1990s. Triple. In roughly one human generation.
These are not abstract readings on a chart somewhere. As the Guardian reports, marine heatwaves bleach coral reefs, strip away kelp forests that shelter young fish, and empty fishing grounds. Hit a ecosystem often enough and it doesn't bounce back. The fishing communities whose food and income come from those waters aren't debating policy abstractions. They're watching their livelihoods dissolve.
The IGCC report is an annual health check on the climate system, compiled by more than 70 researchers from more than 50 institutions worldwide. It exists to fill the gaps between official UN assessments. This year's findings are not ambiguous. The climate system is not struggling. It is failing.
The One Number Nobody Talks About
Here is the concept you need to understand, and almost certainly haven't heard: Earth's energy imbalance. It is the gap between the solar energy coming in and the energy the planet radiates back out to space. In a stable climate those two figures roughly balance. They are no longer roughly balanced.
According to the Guardian's reporting on the IGCC findings, this imbalance has more than doubled since the late 20th century. Greenhouse gases are the biggest driver, thickening the atmospheric insulation and trapping heat that should escape. But there's more going on. Cleaning up air pollution, while genuinely good, also removed a faint reflective haze that was bouncing some sunlight back into space. Melting ice exposes dark ocean that absorbs heat instead of reflecting it. Warming soils and water release their own greenhouse gases. Every feedback loop is pointing the same direction.
The planet is storing heat faster and faster. That imbalance is the engine behind everything else in the report: the fiercer storms, the melting ice, the accelerating sea level rise, the marine heatwaves. Human-induced warming has now reached approximately 1.37 degrees Celsius above pre-industrial levels, per the latest IGCC estimates. We are not close to fine.
Sea Levels Are Also Having a Bad Year
In 2025, sea level rise passed 23 centimeters above the 1901 baseline, a new record. The rate of rise has more than doubled in recent decades and continues to accelerate, according to the IGCC report as covered by the Guardian.
This matters because sea level rise is not a slow, polite problem. It raises the floor of every tide and every storm surge. Coastlines that flooded during a once-in-fifty-year storm now flood during a once-in-ten-year storm. The communities watching the waterline creep closer are not future projections. They are current residents making current decisions about whether their homes are worth keeping.
And Now We're Turning Off the Sensors
This is where the story turns from alarming to genuinely obscene. The monitoring network that actually tells scientists what is happening in the ocean relies on a sophisticated web of sensors in waters across the globe and satellites above it. That network is being dismantled.
The Guardian reports that four of five monitoring sites across the Pacific and Atlantic are set to be closed, and equipment is already being pulled from the water. Other funding faces similar pressure. The researchers and institutions tracking Earth's energy imbalance are watching their tools disappear.
Karina Von Schuckmann, a senior adviser at Mercator Ocean International and an author on the IGCC report, put it clearly: at the precise moment we most need to see clearly, we are turning off the lights. That is not a metaphor or a rhetorical flourish. It is a literal description of what is happening to climate monitoring infrastructure right now.
The cuts trace back to the broader scaling back of scientific funding under pressure from the current US political environment. The United States has historically been a central funder of global ocean monitoring. When it pulls back, gaps open up that other nations are not positioned to fill quickly.
What the Ocean Has Been Doing for Us
Von Schuckmann has spent her career tracking where the heat from climate change actually goes. The answer is unambiguous: overwhelmingly, the ocean. More than 90% of the excess heat trapped by human activity has been absorbed by seawater rather than warming the air we breathe.
That is not a small thing. Without that absorption, the surface temperature increases we have already seen would have arrived faster and harder. The ocean has been running interference for us for decades, quietly, without asking for anything in return. The least we could do is pay attention to what is happening to it. Instead, we are literally removing the instruments that let us do that.
The Dingo Take
Let's be honest about what this moment actually represents. Scientists have spent decades building a global monitoring system to track a crisis they told us was coming. That system is now being defunded at the precise moment the crisis it was built to track is accelerating past every previous projection. This is not negligence. Negligence implies someone wasn't paying attention. The people making these funding decisions have been told exactly what the consequences are. They are making a choice.
The ocean absorbing 90% of our excess heat is the only reason the last 30 years of climate inaction didn't land harder on human populations. That buffer is visibly strained. Marine heatwaves tripled. Sea level rise doubled. Energy imbalance doubled. The warming has hit 1.37 degrees Celsius. And the response from the people with their hands on the levers of power is to close four of five Pacific and Atlantic monitoring stations and pull the sensors out of the water. Cool. Great. Very smart species we've got here.
Von Schuckmann is careful and measured in her language because that's what scientists do. We don't have to be. Dismantling ocean monitoring infrastructure while the ocean signals systemic distress is not a budget decision. It is a statement about whose future matters. The fishing communities losing their grounds, the coastal residents watching the waterline, the ecosystems tipping past recovery: they are not abstractions. The people turning off the lights know exactly what they are doing.
