About halfway through the most recent United Nations’ annual climate change conference, COP30 in Belém, Carolina Pasquali, my counterpart at Greenpeace Brazil, started to lose her voice. She was suffering from the kind of hoarseness that kicks in when you have been speaking so much that your vocal cords become inflamed.
Carolina’s voice may have become tired during COP30, but she never fell silent. On the last morning of COP30, at Greenpeace’s final press briefing, I found myself standing behind Carolina as a press pack swarmed her, seeking answers to what was happening.
‘Who is that woman?’ I overheard one of the 56,118 registered delegates ask another.
‘With a crowd like that, she must be the Brazilian environment minister’, was the reasoned but inaccurate answer.
With Brazil hosting COP30, and particularly given the storied history of Greenpeace Brazil as a defender of the Amazon rainforest, Carolina carried an enormous load of leadership and advocacy in the lead-up and during the event. It is no wonder her voice was feeling the strain.
I’ve had the privilege of working with Carolina as part of the Greenpeace global leadership community for a few years now, and she’s an excellent colleague—thoughtful, principled, strategic, a brilliant public speaker, and in possession of a wonderful, wry sense of humour. She’s a friend and a terrific leader whom I admire deeply.
It had been Greenpeace Brazil’s vision that emergency action to halt deforestation was core to the demands that civil society brought to the COP. Given the event’s location in the Amazon, it seemed axiomatic that the goal of phasing out fossil fuels must be accompanied by the other critical half of the climate challenge: addressing deforestation, the second-largest driver of climate change.
Late in the afternoon on the second-last day of the COP, a fire broke out in the middle of the venue, sending a huge fork of flame towards the sky. It was a terrifying moment for those present in the venue. Thankfully, due to good design, the wise use of non-flammable materials, and the rapid response of first responders, there were no fatalities or serious injuries.
In her next speech, Carolina thanked those who had fought the blaze and overseen the evacuation, for their speed and bravery. And she reflected with due gravitas, this is what humanity can do: act together in the face of an emergency—whether that be a fire in a building or our whole planet facing global heating.
As it happened, COP30 got within striking distance of delivering a response that was fit for purpose in our times of planetary emergency, with support from a critical mass of countries for formal roadmaps to end deforestation as well as transition away from fossil fuels. But the official text ultimately fell short in the final hours of negotiations. As Carolina said: ‘while many governments are willing to act, a powerful minority is not.’
In these moments of failure by politicians and negotiators, it would be easy to give in to legitimate feelings of anger and frustration; but the task before us is to appraise every moment for opportunities for momentum. And the critical mass of nations that are committed to roadmaps for ending deforestation and phasing out fossil fuels offered light amidst the gloom.
And so we follow the path. We take the chances. We think through the next phase of strategy. And onwards. As Carolina said simply, ‘the work now continues.’
I’m not only grateful for Carolina’s friendship and for Greenpeace Brazil’s steadfast dedication to tackling deforestation in the Amazon, but for the entire Greenpeace network’s shared commitment.
Greenpeace is relied on for some heavy lifting at climate COPs, and our team consisted of policy experts, campaigners and other specialists from various geographies who brought their deep policy, communications, and campaigning expertise from around the world to the event,. Our morning briefings, sharing analysis, agreeing on focus and assigning tasks for the day, were possessed of that special energy that comes from a group of many backgrounds working very long hours together in common cause.
I’ve reflected over my time with Greenpeace, that when I visit any of our offices, bases or vessels, anywhere in the world, I feel at home. I am confident that you would have the same sensation of coming home too, because if you are reading this, then you are part of Greenpeace too–you, and me, Carolina, and the tens of millions of people all over the world that share our common vision of an earth restored to flourishing.
So on we go. The work continues, in love and hope, together.
Q & A
In the aftermath of the collapse of Australia’s COP31 bid, many people have reached out to ask: What happened? Why didn’t Australia get COP31? And what now?
In the lead-up to November’s COP, nobody in Australia would have anticipated that we would not be welcoming the global climate community to Adelaide next summer. Up until the very final moment when Climate and Energy Minister Chris Bowen told reporters that Türkiye would host COP31 with Australia assuming the role of president of negotiations, hope was alive that we would clinch the deal.
I suspect that the full picture of why the COP31 bid slipped through our hands is a complex mix of factors, some of which may never come to light in the public domain. What we do know is that in the UNFCCC system, decisions on COP hosts are made by full consensus rather than voting. So, for as long as Turkiye declined to withdraw its bid, it was never a done deal.
Much will no doubt be said about whether Australia could have done more to boost our chances of securing the bid. But as I said in the immediate aftermath of the announcement, whatever the forum, whoever the President, the urgency and focus of our actions cannot change. Phasing out fossil fuels and ending deforestation must be at the core of the COP31 agenda.
The task for Chris Bowen will now be to use his role as president of negotiations to drive global emissions reductions at speed and scale consistent with the Paris Agreement.
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The planet is heating up more quickly than ever before.
For decades, greenhouse gas emissions caused by human activity have been building up in the atmosphere and trapping ever-higher levels of heat.
The resulting asymmetry between incoming solar energy and energy radiated back out into space – known as “Earth’s energy imbalance” – provides a direct measure of the extent to which humans are disrupting the Earth’s climate system.
This imbalance is growing and in 2025 its 10-year average reached a record high, indicating that global temperatures could increase at even higher rates in the future.
This is among the headline findings of the latest “indicators of global climate change” (IGCC) report, published in the journal Earth System Science Data, which tracks changes in the climate system on an annual basis.
The report, now in its fourth iteration, has been produced by dozens of scientists from around the world.
Its findings are designed to fill the gap between Intergovernmental Panel on Climate Change (IPCC) science reports, which are published every 5-7 years.
In this article, we unpack the IGCC report, which explores how human activity is driving a growing energy imbalance and why monitoring systems to track global climate are so crucial.
(For more on previous IGCC reports, see Carbon Brief’s coverage in 2023, 2024 and 2025.)
Greenhouse gas emissions remain at an all-time high
Global greenhouse gas emissions are continuing to increase, mostly as a result of the use of fossil fuels. However, deforestation, agriculture and industrial processes also play an important role.
Over the most recent decade (2015-24), emissions stood at the equivalent of 54.6bn tonnes of carbon dioxide equivalent (GtCO2e) per year. In 2024, the most recent year for which we have complete data, emissions reached 56.8GtCO2e.
As the chart below shows, these emissions have pushed up atmospheric levels of CO2, methane and nitrous oxide. In 2025, concentrations of these gases reached 425.6 parts per million (ppm), 1936.3 parts per billion (ppb) and 339.4ppb, respectively.
This represents a rise of 3.8%, 3.8% and 2.2%, respectively, since the 2019 levels reported in the IPCC’s sixth assessment report (AR6).
At the same time, declines in emissions of aerosols such as sulphur dioxide, partly as a result of efforts to tackle air pollution, are increasing the Earth’s energy imbalance. This is because aerosols have a cooling effect on the Earth’s climate, counteracting warming from CO2 and other greenhouse gas emissions.
(Tackling sulphur dioxide, alongside other particulate emissions, remains critical because the immediate health and environmental damage they cause far outweighs their short-term cooling effect on the climate.)
The Earth’s energy imbalance is rising rapidly
The Earth’s energy imbalance has long been recognised as a key indicator of how the climate is being affected by human activities.
However, it is only in the last few decades that scientists have been able to record temperature changes deep enough in the ocean to accurately quantify it.
Earth’s energy imbalance measures how quickly excess heat is accumulating in every part of the Earth system, primarily in the ocean, but also in land, ice and atmosphere.
Through this accumulation of heat, the energy imbalance influences the rate of sea level rise and ice melt across the world, as well as increasing the frequency and intensity of extreme weather events, such as storms, floods and droughts.
Without human influence, the Earth’s energy imbalance would be close to zero.
But, as greenhouse gas emissions have built up in the atmosphere, the imbalance has been growing since the 1970s. Recent increases to Earth’s energy imbalance have outpaced those projections made by climate models — indicating the planet could see more warming than expected in the future.
As the right-hand chart below shows, the imbalance is now at a record high, having more than doubled over the past two decades.
It has increased by around 40% since 2019, from an average 0.79 watts per square metre (Wm2) over 2006-18, according to IPCC AR6, to 1.12Wm2 over 2013-25.
The left-hand chart shows how heat is accumulating in the ocean (blues), ice (grey), land (orange) and atmosphere (purple).
Global temperature rise
The excess heat building up in the climate system from the energy imbalance is pushing up global temperatures at a record rate of 0.27C per decade.
We estimate that human-induced warming – the amount of observed global surface
temperature increase attributable to both the direct and indirect effects of human activities – reached 1.37C in 2025. This has risen from 1.0C in 2017, as reported in IPCC AR6.
While natural variability in the climate system – such as El Niño or La Niña events – can also influence temperatures year-to-year, the upward temperature trend we are seeing is being driven by the persistent imbalance in energy.
We now expect global temperatures to exceed the Paris Agreement limit of 1.5C above pre-industrial levels around the year 2030.
This is significant because 1.5C has been identified as the critical dividing line between manageable climate risks and catastrophic, potentially irreversible damage to global ecosystems and human societies.
Heat accumulating throughout the Earth system
While heat is accumulating throughout the Earth system, it is not being distributed evenly around the globe.
Since the 1970s, around 90% of this heat has been taken up by the ocean, affecting marine ecosystems, ocean circulation patterns, sea level rise and climate extremes.
For example, the number of marine heatwave days – periods of unusually high sea surface temperatures – has more than tripled globally since the early 1990s. The year 2025 alone saw 65 days of marine heatwaves – meaning they occurred, on average, more than one day a week.
Meanwhile, the cryosphere – the portion of the Earth made up of frozen water, including glaciers, ice sheets and permafrost – is experiencing widespread ice loss and thawing in response to the growing energy imbalance. This affects ecosystems, sea level rise and infrastructure in polar and high-latitude regions.
Rapid warming has also resulted in record extreme temperatures over land, with average maximum temperatures for any single day over 2016-25 around 1.92C above pre-industrial levels). This is an increase of almost half a degree compared to the previous decade (2006-15).
Sea level rise and the energy imbalance
Sea level rise provides one of the clearest long-term signals of a changing planet.
It is closely linked to Earth’s energy imbalance. As heat accumulates in the ocean, water expands, raising sea levels. Meanwhile, a warming land and atmosphere means addition of water to the oceans through melting of glaciers and ice sheets, also adding to sea level rise.
Over the long-term, sea levels have been rising, on average, at a rate of around 1.8mm per year since 1901, totalling a record 23cm in 2025. This is increasing the risk of coastal flooding, erosion and habitat loss in many low-lying areas around the world.
This rise can be seen in the left-hand chart below, which shows observed global sea level changes from tide gauges (grey and blue dashed lines) and satellites (red dashed lines) since 1901. The solid lines indicate the average across multiple datasets.
Sea level rise is accelerating consistent with the observed increase in Earth’s energy imbalance. Over 2006-25, sea levels have risen at a rate of 3.67mm per year – more than double the rate of 1.69mm per year seen over 1976-95.
This increasing rate is shown in the right-hand figure below, which shows four successive overlapping 20-year periods and the most-recent decade.
(Last year’s transition from El Niño to weak La Niña conditions affected global rainfall patterns and led to a small and temporary fall in global average sea level in 2025. This explains the slight decrease in rate of sea level rise for the most recent decade, which is affected more than the 20-year period 2006-25.)
The bigger picture
Despite greenhouse gas emissions not increasing as rapidly as in the 2000s, this year’s IGCC findings continue to show how far and how fast the climate is changing due to human activity.
A significant increase in decarbonisation efforts in the second half of this decade is required to slow down the rate of human-caused warming and limit the escalation of climate risks and impacts.
These findings, like many others produced by scientists across the globe, rely on international expertise, partnership and the maintenance and availability of global climate datasets and the global observing programmes that underpin them.
This year’s edition of IGCC used more than 40 global datasets produced by research teams around the world, including the NASA satellite record of the Earth’s energy imbalance and the ARGO deep ocean float network.
However, a number of long-term monitoring programmes could be threatened by funding decisions made by governments around the world, most notably the Trump administration in the US.
Local meteorological data and weather balloon measurement programmes in many countries have declined in recent years, especially in Africa, the west Pacific and South America. This reduces scientists’ ability to monitor and understand key indicators of climate change.
This is not just an issue for climate science. Many of these observations are key to weather forecasts and systems that provide early warning for extreme weather. For example, media reports have suggested that recent reductions in weather balloon measurements in Alaska led to a lack of warnings for a recent winter storm.
The continuity and integrity of the climate observations that scientists use to understand how the climate is changing depends on effective and sustained coordination by international organisations, such as the Global Climate Observing System, the World Meteorological Organization and World Climate Research Programme.
Without this data and its coordination, future assessments will be much more difficult at a time when urgent climate action is needed.
The post Guest post: How a record-high ‘energy imbalance’ is driving global warming appeared first on Carbon Brief.
Guest post: How a record-high ‘energy imbalance’ is driving global warming
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