New global study finds marine heatwaves surging, greenhouse gas emissions at record highs, and 1.5°C warming threshold approaching within four years.
BONN — The planet’s most important climate indicators are deteriorating at an unprecedented pace, according to a major international study presented at the Bonn Climate Change Conference 2026, with scientists warning that the world is moving closer to dangerous warming thresholds while marine heatwaves intensify faster than any other measured climate signal.
The study, published in the journal Earth System Science Data, found that all 11 major climate indicators assessed have worsened since the publication of the Intergovernmental Panel on Climate Change (IPCC) Sixth Assessment Report between 2021 and 2023.
Among the indicators examined, marine heatwaves recorded the most dramatic increase, rising by 61.1 per cent. Earth’s energy imbalance increased by 41.8 per cent, while maximum daily temperatures rose by 23.9 per cent.
Researchers say the findings provide one of the clearest snapshots yet of how rapidly climate change is intensifying between major United Nations climate assessments.
RELEVANT SUSTAINABLE GOALS
Scientists Seek to Bridge the Gap Between Climate Reports
The study was conducted by approximately 70 scientists from 17 countries, including India, and was led by the University of Leeds. Several contributors to previous IPCC reports participated in the research.
The work was designed to fill information gaps between major IPCC assessment cycles and provide policymakers with updated scientific evidence on climate trends.
“The study aims to fill potential information gaps between IPCC reports, providing decision makers with timely and scientific information on policy-relevant global climate indicators such as levels of greenhouse gas emissions, human-caused warming, and temperature and climate extremes,” the report stated.
The analysis used methods similar to those employed by the IPCC to measure changes in greenhouse gas emissions, human-induced warming and climate extremes since the last assessment cycle.
Every Major Climate Indicator Is Moving in the Wrong Direction
Researchers found that all 11 climate indicators tracked in the study have increased since the last IPCC assessment. Marine heatwaves showed the steepest rise at 61.1 per cent. Earth’s energy imbalance increased by 41.8 per cent. Maximum daily temperatures rose by 23.9 per cent. Human-induced warming increased by 15.9 per cent.
The study also recorded increases in greenhouse gas concentrations. Overall greenhouse gas levels rose by 2.1 per cent, while carbon dioxide and methane each increased by 3.8 per cent. Nitrous oxide concentrations climbed by 2.2 per cent.
According to the report, human activities pushed global warming to 1.37 degrees Celsius above pre-industrial levels in 2025, making it the third-warmest year on record.
Scientists project that if current trends continue, the internationally significant 1.5°C warming threshold could be exceeded within approximately four years.
Over the decade from 2016 to 2025, land temperatures increased by 1.81°C relative to pre-industrial levels, while ocean temperatures rose by 1.03°C.
Record Heat Accumulation Signals Growing Climate Risk
One of the study’s most significant findings concerns Earth’s energy imbalance, a measure of how quickly heat is accumulating within the climate system.
Professor Piers Forster, Director of the Priestley Centre for Climate Futures at the University of Leeds and lead author of the report, said the imbalance has reached record levels.
Without human influence, Earth’s energy imbalance would remain close to zero. Instead, scientists found it has been increasing steadily since the 1970s and has doubled in recent decades.
The report also found that global greenhouse gas emissions have reached an all-time high of 56.8 billion tonnes of carbon dioxide equivalent, driven primarily by fossil fuel combustion.
“Our study demonstrates that nearly all of the warming over the last decade is driven by human activities,” said Samantha Burgess, a weather expert at the European Centre for Medium-Range Weather Forecasts and one of the report’s authors.
“The impacts on livelihoods and ecosystems are already being felt worldwide, and will accelerate as temperatures continue to increase,” she said.
Researchers reported that human-induced warming is now occurring at an unprecedented rate of approximately 0.27°C per decade.
Fossil Fuel Emissions Continue to Drive Warming
Scientists attributed the acceleration in warming primarily to record greenhouse gas concentrations combined with declining sulphur dioxide emissions. Although reducing sulphur dioxide pollution delivers important air quality benefits, it also reduces the cooling effect previously provided by sulphur aerosols in the atmosphere. As a result, more of the warming influence generated by greenhouse gases is becoming apparent.
One climate expert attending the Bonn talks, who requested anonymity, said the study highlights a widening disconnect between scientific evidence and political action. “All the data are showing that the global climate is moving in the wrong direction,” the expert said.
“Politicians must take responsibility for this suicidal trend.”
Indian Ocean Approaching Near-Permanent Marine Heatwave Conditions
The study carries particularly significant implications for India and countries surrounding the Indian Ocean. India has experienced rising surface air temperatures over the past century, contributing to more frequent, intense and prolonged heatwaves. In 2026, heatwaves arrived earlier than normal across parts of the country.
At the same time, marine heatwaves are becoming increasingly common throughout the Indian Ocean, raising concerns about impacts on fisheries, monsoon systems, coastal ecosystems and tropical cyclones.
“Our research shows that the Indian Ocean is moving towards a near-permanent marine heatwave state by the 2050s,” said Roxi Mathew Koll, a scientist at the Indian Institute of Tropical Meteorology.
A 2024 study led by Koll found that the tropical Indian Ocean has warmed across the entire basin since the beginning of the twentieth century. Between 1950 and 2020, temperatures increased by approximately 0.12°C per decade, the fastest warming rate among all tropical ocean basins.
Researchers also found that warming has penetrated into deeper ocean layers, with ocean heat content increasing down to depths of 2,000 metres.
Fisheries, Monsoons and Coastal Communities Face Growing Pressure
Climate models project that under medium- to high-emissions scenarios, the Indian Ocean could warm by between 1.4°C and 3°C between 2020 and 2100.
The same research projects that marine heatwaves in the tropical Indian Ocean could increase dramatically from roughly 20 days per year during the period from 1970 to 2000 to between 220 and 250 days annually by the end of the century.
Such a shift would push the basin toward a near-permanent marine heatwave state.
Scientists warn that these changes could have far-reaching consequences for countries dependent on the Indian Ocean, affecting marine biodiversity, food security, weather patterns and coastal resilience.
Bonn Climate Talks Confront Growing Scientific Urgency
The findings arrive as negotiators gather in Bonn to discuss climate policy and implementation ahead of future global climate negotiations.
Researchers say the study offers a timely warning that climate indicators continue moving in the wrong direction despite years of international commitments to reduce emissions.
By documenting worsening conditions across every major climate indicator examined, the report underscores the scale of the challenge facing governments, businesses and communities worldwide.
As global warming approaches the 1.5°C threshold and marine heatwaves accelerate across the world’s oceans, scientists say the evidence is increasingly clear: climate change is no longer a future threat but an unfolding reality already reshaping ecosystems, economies and societies around the globe.
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