CO2 Hits Record High as Growth Rate Triples Since 1960

The numbers look grim. By the end of 2025, carbon dioxide levels in the atmosphere reached a peak never before measured. The World Meteorological Organisation (WMO) confirms the concentration sits at 426.8 parts per million. That figure represents 153 per cent of the pre-industrial baseline. It is an all-time high.

Ko Barrett, deputy secretary-general of the WMO, puts it bluntly. "Another year, another new record," he notes. The data shows greenhouse gases trapping an unprecedented amount of heat. This trapped energy fuels more extreme weather events. It poses serious risks to economies and societies worldwide. Barrett warns that CO2 has a very long lifetime. It will affect the global climate for decades, even centuries.

The growth rate has tripled since 1960. In the 1960s, CO2 levels climbed by just 0.8 parts per million per year. Between 2011 and 2020, that pace jumped to 2.4 parts per million annually. The recent spike is even steeper. From 2024 to 2025, the global average concentration rose by 2.8 parts per million. This surge was only slightly smaller than the exceptional jump seen from 2023 to 2024.

Why the slight dip in growth? Oksana Tarasova, WMO scientific adviser, explains the mechanics. The 2024 to 2025 period saw a recovery of land carbon sinks. Fire carbon emissions also dropped in 2025. This followed the strong 2023/2024 El Niño event. That weather pattern reduced biosphere efficiency through drought, drier vegetation, and more wildfires.

But do not expect relief soon. Tarasova predicts a further increase in concentrations in 2026. Fossil fuel burning continues. A powerful El Niño is developing. It will impact land carbon sinks just as it did during the 2023/2024 cycle.

The environmental cost is mounting. Between 1990 and 2025, radiative forcing increased by 56 per cent. The National Oceanic and Atmospheric Administration tracks this cumulative warming effect. CO2 accounts for 81 per cent of that rise.

Countries have made promises. Net Zero targets are on the books. Green policies are being pursued. Yet the data tells a starkly different story. Emissions have not decreased as renewable power projects expand. They have only continued to grow. Experts warn this relentless increase has locked in years of long-term temperature increases. Urgent action is no longer optional; it is the only path forward.

The diagram maps out how greenhouse gases have driven global warming from the pre-industrial era through 2025. Carbon dioxide dominates the conversation, but it is far from alone. Methane and nitrous oxide, the second and third most potent warming agents, have also shattered historical records. These pollutants are hitting concentrations never before seen in human measurement history.

Methane drives about 16 per cent of the warming effect on our climate. It reached 1,948 parts per billion. That figure stands at 267 per cent of the level recorded in 1750. Nitrous oxide is climbing just as fast. Its concentration hit 339.1 parts per billion, marking 126 per cent of the pre-industrial baseline. These numbers tell a grim story of accelerating atmospheric pollution.

A new threat emerges from the electric grid itself. As nations electrify, scientists are tracking a steady rise in sulphur hexafluoride. This gas acts as a spark suppressant in electricity distribution. Its levels have climbed consistently for three decades. The danger is severe. It lingers in the atmosphere for over 1,000 years. Its 100-year global warming potential is approximately 24,300 times that of CO2.

Professor Joeri Rogelj, a climate scientist at Imperial College London, sees a troubling pattern. "We see a continued upward trend in the climate pollution that is annually dumped into the atmosphere," he told the Daily Mail. He noted that while the pace of global greenhouse gas emissions growth has slowed compared to earlier decades, the increase still moves in the wrong direction. It is the opposite of what is necessary to stop climate change from worsening.

The persistence of these gases creates a long-term lock-in effect. CO2 and others can stay in the atmosphere for years. Even a small concentration increase today locks in temperature rises for future generations. Experts insist governments must cut emissions rapidly to prevent the worst outcomes.

Super El Niño adds another layer of risk. Forecasters expect it to peak in December and remain strong into next spring. This could spike overall CO2 emissions through drought and wildfires. The Earth is already on track for its hottest year on record following a brutal summer of extreme temperatures.

Professor Pierre Friedlingstein, an expert on the global carbon cycle at Exeter University, warns that we will breach the 1.5°C global warming threshold above pre-industrial levels in coming years. "Keeping warming well below 2°C will require rapid, deep and sustained GHG emissions reductions," he told the Daily Mail. He emphasized that climate change only stops when anthropogenic greenhouse gas emissions reach net zero. This requires massive reductions, with remaining emissions from hard-to-abate sectors compensated by anthropogenic negative emissions like carbon dioxide removal.

Yet, amidst the record emissions, some experts spot a glimmer of hope. Professor Piers Forster, director of the Priestley Centre for Climate Futures, told the Daily Mail that the world will "experience major impacts over the next few years." But he insists there are reasons for optimism.

He pointed to shifting energy trends. "Probing other data, it’s not all bad news. Renewable energy generation overtook coal generation in 2025," he said. Despite rising electricity use from EVs, data centres, and air conditioning, the increase was met by a rise in renewable energy use. Fossil fuel electricity generation actually declined slightly. This shift marks a turning point, even if the challenge remains immense.