There is a “massive gap between rhetoric and reality” that must be closed by new climate pledges being drafted under the Paris Agreement, the UN Environment Programme (UNEP) says.
In the 15th edition of its annual “emissions gap” report, the UNEP calls for “no more hot air” as countries approach the February 2025 deadline to submit their next nationally determined contributions (NDCs) setting mitigation targets for 2035.
These NDCs “must deliver a quantum leap in ambition in tandem with accelerated mitigation action in this decade”, the report says.
The report charts the “gap” between where emissions are headed under current policies and commitments over the coming decade, compared to what is needed to meet the Paris goal of limiting global warming to “well below” 2C and pursuing efforts to stay under 1.5C.
It highlights that greenhouse gas emissions reached record levels in 2023, up 1.3% from 2022, and rising notably faster than the average over the past decade.
The report warns that both progress and ambition have “plateaued” in recent years, with relatively little of substance occurring since the pledges made at COP26 in 2021. And many countries are not even on track to meet their existing NDCs, with current policy projections from G20 nations exceeding NDC commitments by a collective 1bn tonnes of greenhouse gas emissions (in carbon dioxide equivalent, CO2e) in 2030.
Current policies put the world on track for 2.9C of warming by 2100, the report finds – though this could be reduced to 2.4-2.6C, if all existing NDCs are met.
But unless global emissions in 2030 are brought below the levels implied by current NDCs, a pathway to 1.5C with no or limited overshoot becomes “impossible”, the report says, and “strongly” increases the challenge of limiting warming to 2C.
While the magnitude of the challenge is “indisputable”, there are “abundant opportunities for accelerating mitigation”, the report says. It finds that global emissions could be cut by 54% by 2030 and 72% by 2035 at a cost of less than $200 per tonne of CO2.
This indicates that the gap between commitments and current policies is a result of a lack of policy support rather than more fundamental barriers to decarbonisation.
(For previous reports, see Carbon Brief’s detailed coverage in 2014, 2015, 2016, 2017, 2018, 2019, 2020, 2021, 2022 and 2023.)
Global greenhouse gas emissions at record levels
The UNEP report finds that human emissions of greenhouse gases – CO2, methane, nitrous oxide and fluorinated gases (F-gases) – reached a record 57.1bn tonnes of CO2 equivalent (GtCO2e) in 2023.
The chart below shows how fossil CO2 (black) is by far the largest contributor to annual emissions and the main driver of the increase in recent decades, with methane (grey) playing the second largest role.
Global emissions grew 1.3% (0.7 GtCO2e) in 2023, compared with 2022 levels – a rate notably faster than that over the prior decade (2010-19, at 0.8 GtCO2e per year).
(As the report notes, these numbers do not include many of the climate-related impacts on greenhouse gas emissions that are not a result of direct human interventions – such as the catastrophic Canadian wildfires in 2023. The ability of the biosphere to absorb a portion of human emissions is broadly expected to weaken under scenarios where the world does not rapidly reduce emissions.)
These emissions were driven by energy use, industrial process emissions and land-use change across a variety of sectors.
As the chart below shows, electricity generation was the largest driver of greenhouse gas emissions globally in 2023, responsible for approximately 26% of the total. Other major contributors were transportation (15%), industry (11%), fossil-fuel production (10%) and industrial processes (9%).
The report finds that global aviation had the largest relative increase in emissions, increasing 19.5% between 2022 and 2023 as the sector recovered from Covid-era lows. Fossil-fuel production emissions, road transportation and industrial process emissions also increased notably from 2022.
The authors note that the fossil share of generation is starting to decrease in the power sector as solar and wind expand rapidly, with capacity additions increasing by 50% in 2023. Global investment in renewable power, grids and storage is now considerably higher than global investment in oil, gas and coal.
Despite rapid growth in clean energy, power-sector emissions have yet to peak, with new clean additions globally not quite keeping up with the rate of demand growth. However, the report notes that both power-sector emissions and overall global greenhouse emissions are expected to peak in the next few years, even if they did not in 2023.
An even wider emissions gap
The primary focus of this edition of the report is tracking the gap between where the world is heading today – both under current policies and near-term commitments – and what would be needed to meet Paris Agreement goals of limit warming to well-below 2C.
However, since the 2023 report, there have not been any notable changes in country pledges or policies – and global emissions continued to grow.
This means that the emissions gap is wider than it was last year and the world is further off track from its climate goals.
The report explores a number of different future emissions scenarios including: those under policies in place today; emissions if Paris Agreement NDCs are met; emissions if both NDCs and national-level net-zero pledges are met; and emissions required under scenarios that limit warming to below 2C and to 1.5C with no or limited overshoot by 2100.
While these NDCs – alongside other policies enacted by countries – have helped move the world away from some of the darkest climate futures that seemed plausible a decade ago, the gap continues to grow between where the world is today and a path to meeting the Paris Agreement.
The report finds an emissions gap in 2030 of around 14GtCO2e between where the world is headed if countries achieve their “unconditional” NDCs (that is, those not conditioned on “climate finance” or other external assistance) – shown by the mid-blue line – and an emissions pathway that limits warming to below 2C (defined in the report as a >66% chance of avoiding 2C warming) – shown by as the pale red line.
The gap is even larger – around 22GtCO2e – between unconditional NDCs and a scenario consistent with limiting warming to 1.5C by the end of the century (red line). If conditional NDCs are fully implemented in addition to unconditional ones (light blue line), this emissions gap would shrink by around 3GtCO2e in 2030 for both the 2C and 1.5C scenarios.
If NDCs are not strengthened by 2035, this gap would grow to 18GtCO2e for keeping warming below 2C and 29GtCO2e for 1.5C, the report finds. In the absence of a ratcheting up of commitments in recent years, limiting warming to 1.5C with no or low overshoot is now much more difficult to achieve. Further delays could similarly imperil the 2C target.
In addition, many countries are “not even on track to deliver on their current NDCs” today, the report says. Major countries, including Australia, Brazil, Canada, Indonesia, Japan, South Korea, the UK and the US, are all off track to meet their targets under existing policies. (Several of those that are on track had set weak targets, it adds.)
Countries are expected to update their NDCs by February 2025 and these should include mitigation targets up to the end of 2035 (compared to the 2030 date for the initial round of Paris NDCs).
However, the ability of post-2030 commitments to put the world on track to limit warming to below 2C is highly dependent on action pre-2030. As the report shows, strong climate action starting in 2024 would require a 4% reduction per year on average, while doing so in 2030 would increase this to 8% per year.
An upward revision of current policy warming
The UNEP report author team has been one of the main groups assessing the range of warming impacts the world could expect under current policies. However, their estimate has continued to increase over the past three reports – from 2.6C in 2022 to 2.7C in 2023 and 2.9C in 2024. This reflects both continued increases in global greenhouse gas emissions and methodology updates by UNEP.
The figure below compares these estimates between the 2022 (dark blue) 2023 (mid blue blue) and 2024 (light blue) versions of the UNEP report. Compared to the 2023 report, current policy warming outcomes increased notably, unconditional NDC outcomes were unchanged, conditional NDC warming increased slightly, and net-zero pledge warming decreased slightly.
The report finds that a continuation of current policies would result in a 100% chance of exceeding 1.5C, a 97% chance of exceeding 2C and a 37% chance of exceeding 3C by 2100. (And the world will continue to warm after 2100 as long as CO2 emissions remain above (net) zero.)
Under NDCs, the odds of exceeding 1.5C remains at 100%, while there is a 94% chance of exceeding 2C by 2100 under unconditional NDCs and a 79% chance under conditional NDCs.
If all country net-zero pledges are implemented (which, the report notes, few, if any, countries are on track to achieve today), these likelihoods are reduced to a 77% chance of exceeding 1.5C, a 20% chance of exceeding 2C and a near-zero chance of exceeding 3C.
The figure below compares the latest UNEP estimates (mid blue bars) to others in the literature – the emissions scenarios featured in the Intergovernmental Panel on Climate Change’s (IPCC) sixth assessment report (dark blue), estimates published by Climate Action Tracker (light blue), and the IEA’s 2024 World Energy Outlook (grey).
Current policy outcomes are broadly in-line with the IPCC’s middle-of-the-road SSP2-4.5 scenario, though a notable gap has developed in recent years between UNEP and IEA estimates. While the three were nearly identical in 2021, the UNEP’s current policy warming estimate has increased while the IEA’s has decreased.
The UNEP provides a high-end warming estimate for its scenarios that is notably higher than that of other groups. This is because its approach includes both future emissions uncertainties associated with each scenario, plus the range of possible climate system responses from climate sensitivity and carbon cycle feedbacks. While the latter can be expressed probabilistically, the likelihood of future emissions outcomes under these scenarios are more difficult to assess.
High potential for deep emissions cuts
While countries are far from being n track to meet Paris Agreement goals today, the new report explores what it would entail – and cost – to close the emissions gap.
They find that, across all sectors of the economy, global emissions could be reduced by 31GtCO2e by 2030 (54% below current policy levels) for a cost of less than $200 per tonne of CO2. In 2035 this increases to 41GtCO2e (a 72% reduction from current policy levels), reflecting expected continued cost declines of mitigation technologies.
The figure below, taken from the report, shows the assessed mitigation potential for $200 per tonne of CO2 or below for each different sector of the economy.
The energy sector has the largest potential for low-cost decarbonisation at 12GtCO2e/yr in 2030 and 15GtCO2e/yr in 2035, largely driven by the replacement of fossil fuel electricity production with clean energy sources.
Agriculture, forestry and other land uses (AFOLU sector) have the second largest potential for decarbonisation, with forestry making up the largest component of this.
While substantial increases in investments and finance are required to accelerate mitigation across all of these sectors, the report shows that deep decarbonisation is achievable in the next decade at a reasonable cost.
Ultimately, the report highlights that the growing emissions gap reflects a lack of political will by countries to address emissions, rather than any fundamental constraint on the world’s ability to rapidly mitigate.
The post UNEP: New climate pledges need ‘quantum leap’ in ambition to deliver Paris goals appeared first on Carbon Brief.
UNEP: New climate pledges need ‘quantum leap’ in ambition to deliver Paris goals
Drought and heatwaves occurring together – known as “compound” events – have “surged” across the world since the early 2000s, a new study shows.
Compound drought and heat events (CDHEs) can have devastating effects, creating the ideal conditions for intense wildfires, such as Australia’s “Black Summer” of 2019-20 where bushfires burned 24m hectares and killed 33 people.
The research, published in Science Advances, finds that the increase in CDHEs is predominantly being driven by events that start with a heatwave.
The global area affected by such “heatwave-led” compound events has more than doubled between 1980-2001 and 2002-23, the study says.
The rapid increase in these events over the last 23 years cannot be explained solely by global warming, the authors note.
Since the late 1990s, feedbacks between the land and the atmosphere have become stronger, making heatwaves more likely to trigger drought conditions, they explain.
One of the study authors tells Carbon Brief that societies must pay greater attention to compound events, which can “cause severe impacts on ecosystems, agriculture and society”.
Compound events
CDHEs are extreme weather events where drought and heatwave conditions occur simultaneously – or shortly after each other – in the same region.
These events are often triggered by large-scale weather patterns, such as “blocking” highs, which can produce “prolonged” hot and dry conditions, according to the study.
Prof Sang-Wook Yeh is one of the study authors and a professor at the Ewha Womans University in South Korea. He tells Carbon Brief:
“When heatwaves and droughts occur together, the two hazards reinforce each other through land-atmosphere interactions. This amplifies surface heating and soil moisture deficits, making compound events more intense and damaging than single hazards.”
CDHEs can begin with either a heatwave or a drought.
The sequence of these extremes is important, the study says, as they have different drivers and impacts.
For example, in a CDHE where the heatwave was the precursor, increased direct sunshine causes more moisture loss from soils and plants, leading to a drought.
Conversely, in an event where the drought was the precursor, the lack of soil moisture means that less of the sun’s energy goes into evaporation and more goes into warming the Earth’s surface. This produces favourable conditions for heatwaves.
The study shows that the majority of CDHEs globally start out as a drought.
In recent years, there has been increasing focus on these events due to the devastating impact they have on agriculture, ecosystems and public health.
In Russia in the summer of 2010, a compound drought-heatwave event – and the associated wildfires – caused the death of nearly 55,000 people, the study notes.
The record-breaking Pacific north-west “heat dome” in 2021 triggered extreme drought conditions that caused “significant declines” in wheat yields, as well as in barley, canola and fruit production in British Columbia and Alberta, Canada, says the study.
Increasing events
To assess how CDHEs are changing, the researchers use daily reanalysis data to identify droughts and heatwaves events. (Reanalysis data combines past observations with climate models to create a historical climate record.) Then, using an algorithm, they analyse how these events overlap in both time and space.
The study covers the period from 1980 to 2023 and the world’s land surface, excluding polar regions where CDHEs are rare.
The research finds that the area of land affected by CDHEs has “increased substantially” since the early 2000s.
Heatwave-led events have been the main contributor to this increase, the study says, with their spatial extent rising 110% between 1980-2001 and 2002-23, compared to a 59% increase for drought-led events.
The map below shows the global distribution of CDHEs over 1980-2023. The charts show the percentage of the land surface affected by a heatwave-led CDHE (red) or a drought-led CDHE (yellow) in a given year (left) and relative increase in each CDHE type (right).
The study finds that CDHEs have occurred most frequently in northern South America, the southern US, eastern Europe, central Africa and south Asia.
Threshold passed
The authors explain that the increase in heatwave-led CDHEs is related to rising global temperatures, but that this does not tell the whole story.
In the earlier 22-year period of 1980-2001, the study finds that the spatial extent of heatwave-led CDHEs rises by 1.6% per 1C of global temperature rise. For the more-recent period of 2022-23, this increases “nearly eightfold” to 13.1%.
The change suggests that the rapid increase in the heatwave-led CDHEs occurred after the global average temperature “surpasse[d] a certain temperature threshold”, the paper says.
This threshold is an absolute global average temperature of 14.3C, the authors estimate (based on an 11-year average), which the world passed around the year 2000.
Investigating the recent surge in heatwave-leading CDHEs further, the researchers find a “regime shift” in land-atmosphere dynamics “toward a persistently intensified state after the late 1990s”.
In other words, the way that drier soils drive higher surface temperatures, and vice versa, is becoming stronger, resulting in more heatwave-led compound events.
Daily data
The research has some advantages over other previous studies, Yeh says. For instance, the new work uses daily estimations of CDHEs, compared to monthly data used in past research. This is “important for capturing the detailed occurrence” of these events, says Yeh.
He adds that another advantage of their study is that it distinguishes the sequence of droughts and heatwaves, which allows them to “better understand the differences” in the characteristics of CDHEs.
Dr Meryem Tanarhte is a climate scientist at the University Hassan II in Morocco, and Dr Ruth Cerezo Mota is a climatologist and a researcher at the National Autonomous University of Mexico. Both scientists, who were not involved in the study, agree that the daily estimations give a clearer picture of how CDHEs are changing.
Cerezo-Mota adds that another major contribution of the study is its global focus. She tells Carbon Brief that in some regions, such as Mexico and Africa, there is a lack of studies on CDHEs:
“Not because the events do not occur, but perhaps because [these regions] do not have all the data or the expertise to do so.”
However, she notes that the reanalysis data used by the study does have limitations with how it represents rainfall in some parts of the world.
Compound impacts
The study notes that if CDHEs continue to intensify – particularly events where heatwaves are the precursors – they could drive declining crop productivity, increased wildfire frequency and severe public health crises.
These impacts could be “much more rapid and severe as global warming continues”, Yeh tells Carbon Brief.
Tanarhte notes that these events can be forecasted up to 10 days ahead in many regions. Furthermore, she says, the strongest impacts can be prevented “through preparedness and adaptation”, including through “water management for agriculture, heatwave mitigation measures and wildfire mitigation”.
The study recommends reassessing current risk management strategies for these compound events. It also suggests incorporating the sequences of drought and heatwaves into compound event analysis frameworks “to enhance climate risk management”.
Cerezo-Mota says that it is clear that the world needs to be prepared for the increased occurrence of these events. She tells Carbon Brief:
“These [risk assessments and strategies] need to be carried out at the local level to understand the complexities of each region.”
The post Heatwaves driving recent ‘surge’ in compound drought and heat extremes appeared first on Carbon Brief.
Heatwaves driving recent ‘surge’ in compound drought and heat extremes
Greenhouse Gases
DeBriefed 6 March 2026: Iran energy crisis | China climate plan | Bristol’s ‘pioneering’ wind turbine
Welcome to Carbon Brief’s DeBriefed.
An essential guide to the week’s key developments relating to climate change.
This week
Energy crisis
ENERGY SPIKE: US-Israeli attacks on Iran and subsequent counterattacks across the Middle East have sent energy prices “soaring”, according to Reuters. The newswire reported that the region “accounts for just under a third of global oil production and almost a fifth of gas”. The