In 2024, global average surface temperature exceeded the 1.5 degrees Celsius threshold above the pre-industrial baseline for the first time in a full calendar year. That threshold was established in the 2015 Paris Agreement as a preferred ceiling — a level below which the most severe climate impacts might be avoided. The Copernicus Climate Change Service recorded 2024 at approximately 1.54 degrees Celsius above the pre-industrial average, making it the warmest year on record. The year before it held the record. The year before that did too. The past decade (2015-2024) is the warmest 10-year period since instrumental records began.

The data in 2026 is not ambiguous. Atmospheric CO2 has reached 426 parts per million — the highest in approximately 3-5 million years. The economic losses from extreme weather events are rising. Sea levels are measurably higher. Arctic sea ice extent is at record lows. These are measurements, not models — and they are consistent across dozens of independent monitoring systems operated by agencies with no collective incentive to exaggerate.

At the same time, the data also shows genuine cause for guarded optimism in specific areas. Solar energy has grown faster than virtually every expert projection. Fossil fuel demand is approaching a historical peak for the first time. The cost of clean energy has fallen so dramatically that the economic case for the energy transition is now independent of climate concerns in most markets. Whether these positive trends are happening fast enough to avoid the worst projected outcomes is the central empirical and policy question of our time.

"The climate crisis is not a future threat. It is the present reality. The question is not whether we act, but whether we act fast enough to preserve a livable planet for the people who will inherit it." — Antonio Guterres, UN Secretary-General, COP29, 2024

Key Definitions

Pre-Industrial Baseline: The average global surface temperature over the period 1850-1900, used as the reference point for measuring warming. This period predates large-scale industrial fossil fuel burning and is the baseline established in the Paris Agreement.

PPM (Parts Per Million): A unit of concentration. CO2 concentration of 426 ppm means that for every million molecules of air, approximately 426 are CO2. Pre-industrial CO2 was approximately 280 ppm.

Attribution Science: The scientific field that estimates how much climate change affected the probability and/or intensity of specific weather events. Uses climate models to compare the likelihood of an event in the current climate versus a hypothetical climate without human-caused warming.

Paris Agreement: A 2015 international treaty signed by 196 countries committing to 'pursuing efforts' to limit warming to 1.5 degrees Celsius above pre-industrial levels, with a hard limit of 2.0 degrees. The 1.5 degree target is widely considered the threshold below which the most catastrophic climate impacts can be avoided.

NDC (Nationally Determined Contribution): Each country's self-set emissions reduction plan under the Paris Agreement. NDC targets are submitted every 5 years and are not legally binding. The gap between current NDC commitments and the emissions reductions required to meet the 1.5 degree target is a central measure of global climate ambition.

Temperature: The Record-Breaking Streak

The evidence on global temperature is among the most robust and multi-sourced in climate science. Four major independent temperature datasets — NASA's GISS Surface Temperature Analysis, NOAA's Global Surface Temperature dataset, the UK Met Office HadCRUT5 dataset, and the Copernicus ERA5 reanalysis — all show the same trend with remarkable consistency.

Global average surface temperature in 2024 was 1.54 degrees Celsius above the pre-industrial (1850-1900) baseline, according to the Copernicus Climate Change Service's annual summary released in January 2025. This was the first full calendar year on record to exceed the 1.5 degree threshold. Every month of 2024 was the warmest recorded for that month in the instrumental record.

The decade 2015-2024 is the warmest 10-year period since instrumental records began in the mid-19th century, as confirmed by the World Meteorological Organization. Nine of the 10 years in that period individually rank as among the warmest on record. The only interruption to the streak was 2021, when La Nina conditions slightly moderated global average temperatures.

The rate of warming has accelerated. NASA's GISS data shows that global average temperature warmed at approximately 0.14 degrees Celsius per decade in the second half of the 20th century. In the first two decades of the 21st century, the rate increased to approximately 0.18-0.20 degrees Celsius per decade. This acceleration reflects both rising baseline CO2 concentrations and the waning of aerosol cooling effects as air pollution regulations have cleaned up sulfate emissions in many regions.

Ocean temperatures have shown particularly alarming trends. Global sea surface temperatures set records throughout 2023 and 2024, with the North Atlantic showing temperatures far above historical averages — approximately 1.5 degrees Celsius above the 20th-century average for extended periods. Scientists attribute the anomalous Atlantic warming to a combination of climate change and the shift from El Nino/La Nina cycles, though the full explanation remains under investigation.

Without significant additional emissions reductions, current trajectory modeling by the IPCC and by the Climate Action Tracker shows warming of approximately 2.5-2.9 degrees Celsius above pre-industrial levels by 2100, assuming countries meet their stated NDC commitments. Scenarios in which current policy continues without new commitments point to approximately 3.2 degrees.

Atmospheric CO2: The Long-Term Record

The Keeling Curve — the record of atmospheric CO2 measurements at NOAA's Mauna Loa Observatory in Hawaii, begun in 1958 by Charles David Keeling — is among the most consequential scientific time series in history. The 2024 annual peak CO2 concentration reached approximately 426 ppm in May.

Pre-industrial CO2 concentration was approximately 280 ppm, as determined from ice core records. The current 426 ppm represents approximately a 52% increase above pre-industrial levels. Annual rates of increase have themselves been accelerating: the 1990s averaged approximately 1.5 ppm per year; the 2010s averaged approximately 2.4 ppm per year; 2023 showed the highest single-year increase recorded at approximately 3.0 ppm.

Paleoclimate records — ice cores from Greenland and Antarctica, ocean sediment cores — establish that current CO2 concentrations are the highest in approximately 3-5 million years. The last time the atmosphere contained comparable CO2 was during the Pliocene Epoch, when global temperatures were approximately 2-3 degrees Celsius warmer than today and sea levels were approximately 15-25 meters higher. This geological context illustrates the long-term consequences of current CO2 levels even if warming unfolds slowly.

Methane (CH4) and nitrous oxide (N2O) — the second and third most important long-lived greenhouse gases — have also reached record atmospheric concentrations. Methane concentrations in 2024 reached approximately 1,921 parts per billion (ppb), approximately 2.6x pre-industrial levels. The accelerating methane growth in recent years is a significant scientific concern, with wetland emissions, livestock agriculture, and fossil fuel operations all contributing. Methane is approximately 86x more potent than CO2 as a greenhouse gas over a 20-year timeframe, making its increase particularly significant for near-term warming.

Extreme Weather: Frequency, Severity, and Economic Cost

Attribution science has advanced to the point where scientists can now quantify, with statistical confidence, how much climate change increased the probability of specific extreme weather events. The findings are consistent: climate change is making extreme heat events, intense precipitation, and severe flooding substantially more likely.

Munich Re's 2025 Natural Catastrophe Report documented global economic losses from natural catastrophes of approximately $320 billion in 2024 — the second-highest annual total on record. Insured losses reached $140 billion, the third-highest on record. The trend in losses is unmistakably upward: average annual insured losses from natural disasters were approximately $40 billion per year in the 1990s, approximately $60 billion in the 2000s, approximately $80 billion in the 2010s, and have averaged over $110 billion in the first half of the 2020s.

In the United States specifically, NOAA's Billion-Dollar Weather and Climate Disasters database provides the most comprehensive US record. The US experienced approximately 28 separate billion-dollar weather disaster events in 2023, and 24 in 2024 (preliminary count). The 1980-2023 annual average was approximately 8.5 events per year. The 2019-2023 average was approximately 23 per year. The upward trend is both a climate signal and a reflection of increasing development in vulnerable areas.

Heat waves have become the most statistically robust extreme weather category in attribution analysis. A 2024 study published in Science found that the 2023 extreme heat across southern Europe and North Africa — which caused approximately 47,000 excess deaths in Europe alone — was made approximately 4.5x more likely by climate change. A study on the 2021 Pacific Northwest heat dome (which saw temperatures of 49.6 degrees Celsius in Lytton, Canada) found it would have been 'virtually impossible' without climate change.

Tropical cyclone intensity (though not frequency) has been increasing. A 2020 NOAA review found that the proportion of tropical cyclones reaching Category 4 or 5 intensity has increased by approximately 25-30% since the 1970s. Hurricane Harvey (2017), Hurricane Ida (2021), and several subsequent major storms showed rainfall rates that attribution studies found were 10-40% more intense due to climate change's effect on atmospheric moisture capacity.

Wildfire area burned has increased significantly in multiple regions. California's record-setting wildfire years of 2020 and 2021 (each burning over 4 million acres) were followed by devastating fires in Australia (2019-2020), Canada (2023, the worst wildfire season in Canadian history at over 18 million hectares burned), and Greece (2023). The Greek Evros fires set a new EU wildfire record. Attribution studies find that climate change significantly increases the probability and potential scale of these events by extending drought conditions and fire weather.

Country Emissions Breakdown

Global CO2 emissions from fossil fuels and industry reached a record high of approximately 37.4 billion tonnes in 2023, per the Global Carbon Project. This was a slight increase from 37.2 billion tonnes in 2022.

China is the world's largest emitter at approximately 31% of global CO2 from fossil fuels — approximately 11.6 billion tonnes in 2023. China's emissions have grown enormously since 2000 as it industrialized, though growth has slowed significantly in recent years as its economy matures and renewable energy expands. China is also the world's largest installer of renewable energy.

The United States emits approximately 5.4 billion tonnes annually, approximately 14% of the global total — down from its historical peak (it was the largest emitter until China surpassed it in 2006). Per capita US emissions of approximately 14 tonnes CO2 per person remain among the highest in the world for a large economy.

India has become the world's third-largest emitter, at approximately 2.9 billion tonnes (7.8% of global total), and its emissions are growing as its economy develops. However, at approximately 2 tonnes per capita, India's per-person emissions are among the lowest of any major economy.

The European Union collectively emits approximately 2.6 billion tonnes, approximately 7% of the global total — down approximately 29% from 1990 levels, making the EU the major economic bloc that has reduced emissions most significantly since the Kyoto Protocol era.

Russia emits approximately 1.9 billion tonnes (5%), and Japan approximately 1.1 billion tonnes (3%).

The cumulative emissions picture — accounting for all CO2 emitted since industrialization — places the United States first (approximately 25% of all historical human CO2 emissions), followed by the EU (approximately 22%), China (approximately 12.7%), and Russia (approximately 6%). This historical context underpins the principle of 'common but differentiated responsibilities' in climate negotiations — the idea that developed countries bear greater responsibility for the current atmospheric state.

Renewable Energy: The Fastest Deployment in Energy History

Against the weight of the emissions and temperature data, the renewable energy trajectory provides the most significant cause for optimism about long-term outcomes.

The International Energy Agency's 2025 Renewables report documented that solar PV capacity additions in 2024 totaled approximately 593 GW — more than all other electricity generation technologies combined. This is more than 50x the solar capacity added in 2010. Global solar capacity exceeded 2,000 GW by end of 2025, having doubled in approximately 3 years.

Wind power additions in 2024 reached approximately 120 GW globally, with China accounting for approximately 65% of new wind installations. Global wind capacity exceeded 1,100 GW by end of 2025.

Solar module prices have fallen approximately 90% since 2010, making solar the cheapest electricity source in history — cheaper than any new fossil fuel plant in most markets globally, even before carbon pricing. BNEF's Levelized Cost of Energy analysis for 2025 shows utility-scale solar in favorable locations at $25-40 per megawatt-hour, compared to $60-100 for new natural gas and $70-130 for new coal.

Battery storage — critical for managing the variability of solar and wind — has similarly seen dramatic cost declines. Lithium-ion battery pack prices fell from approximately $1,200 per kWh in 2010 to approximately $115 per kWh in 2024, per BNEF's Battery Price Survey. At approximately $75-80 per kWh (projected for 2026-2027), battery storage becomes cost-competitive with gas peaker plants for grid balancing purposes.

Electric vehicle (EV) adoption continues to grow rapidly. Global EV sales exceeded 17 million units in 2024, representing approximately 19% of all new passenger car sales, per the IEA. China leads EV adoption at approximately 45% market share for new vehicles. Europe follows at approximately 20%. The United States is growing but trails at approximately 9%.

The IEA's World Energy Outlook 2024 reported for the first time that global demand for all fossil fuels is projected to peak before 2030 under current policy trajectories — a statement that would have seemed implausible 10 years ago. Oil demand is projected to plateau around 2027-2028, coal has already peaked in most scenarios, and natural gas may peak in the early 2030s.

Sea Level Rise and Ice Loss

Sea level rise has accelerated. Satellite altimeter data from NASA/CNES Jason satellites shows that global average sea level has risen approximately 100 millimeters (10 centimeters) since 1993, with the rate of rise itself accelerating. Current rates of approximately 4.5 mm per year are approximately double the 20th-century average rate of approximately 1.7 mm per year.

Greenland and Antarctic ice sheets are losing ice at accelerating rates. Greenland's ice sheet lost an average of approximately 279 billion tonnes of ice per year between 2002 and 2023, per NASA's GRACE-FO satellite data. Antarctica lost approximately 150 billion tonnes per year over the same period. Combined, the two ice sheets contribute approximately 1.6 mm of sea level rise per year — the single largest contributor. Thermal expansion of warming ocean water contributes an additional approximately 1.5 mm per year.

Arctic sea ice extent has declined dramatically. The September minimum sea ice extent (the annual minimum, typically occurring in mid-September) has decreased approximately 13% per decade since satellite records began in 1979. Ice-free Arctic summers — once projected for 2080 or later — are now projected by multiple research groups to occur regularly by the 2030s or 2040s under medium-emissions scenarios.

Renewable energy deployment and cost reduction represent the most significant positive development. The fact that the energy transition is now economically rational in most markets — independent of climate policy — means it will proceed regardless of political volatility around climate legislation.

Global deforestation rates declined in Brazil — historically the largest source of tropical deforestation — following a change in government in 2023. Amazon deforestation fell approximately 50% in 2023 and continued declining in 2024, according to Brazil's National Institute for Space Research (INPE). Congo Basin and Indonesian deforestation have shown more mixed trends.

Ozone layer recovery is one of the clear environmental successes of the past four decades. The Montreal Protocol's elimination of ozone-depleting substances has allowed the ozone layer to begin recovering. NOAA and WMO data shows the Antarctic ozone hole is approximately 20% smaller than its 2000-era peak. Full recovery is projected by approximately 2065-2070 — a demonstration that coordinated global action on environmental problems can work.

Carbon capture and storage (CCS) technologies, while still expensive and unproven at scale, have seen meaningful deployment growth. Direct Air Capture (DAC) capacity, while still tiny (removing thousands of tonnes per year versus the billions needed to be meaningful), has grown significantly with government support in the US, UK, and EU.

Practical Implications

For businesses, the transition away from fossil fuels represents both operational risk (stranded assets, energy price volatility, carbon pricing) and opportunity (clean energy investment, green product positioning, efficiency improvements). The IEA's fossil fuel peak demand projection is a material signal for any business with significant exposure to fossil fuel value chains.

For investors, the combination of falling renewable energy costs and rising physical climate risk creates both opportunities (clean energy infrastructure, climate adaptation) and risks (physical asset exposure in coastal and flood-prone areas, transition risk for fossil fuel holdings). Major financial institutions including the Bank of England, the Federal Reserve, and the ECB are all developing climate stress testing frameworks for financial risk.

For policymakers, the data supports two complementary approaches: accelerating the deployment of technologies that are already economically competitive (solar, wind, EVs, heat pumps) and investing in the resilience infrastructure required to manage the warming that is already locked in by existing emissions.

References

  1. Copernicus Climate Change Service. (2025). European State of the Climate 2024. climate.copernicus.eu.
  2. NOAA Global Monitoring Laboratory. (2025). Trends in Atmospheric Carbon Dioxide: Mauna Loa. gml.noaa.gov.
  3. International Energy Agency. (2024). World Energy Outlook 2024. iea.org.
  4. International Energy Agency. (2025). Renewables 2025. iea.org.
  5. Global Carbon Project. (2024). Global Carbon Budget 2024. globalcarbonproject.org.
  6. IPCC. (2023). Sixth Assessment Report, Synthesis Report. ipcc.ch.
  7. Munich Re. (2025). Natural Catastrophe Statistics 2024. munichre.com.
  8. NOAA National Centers for Environmental Information. (2025). Billion-Dollar Weather and Climate Disasters. ncei.noaa.gov.
  9. World Meteorological Organization. (2025). State of the Global Climate 2024. wmo.int.
  10. BloombergNEF. (2025). New Energy Outlook 2025. bnef.com.
  11. NASA Goddard Institute for Space Studies. (2025). GISS Surface Temperature Analysis (GISTEMP). giss.nasa.gov.
  12. Friedlingstein, P., et al. (2024). Global Carbon Budget 2024. Earth System Science Data, 16.

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Frequently Asked Questions

How much has global temperature risen since pre-industrial levels?

Global average surface temperature in 2024 was approximately 1.54 degrees Celsius above the pre-industrial baseline (1850-1900 average), according to the Copernicus Climate Change Service. This made 2024 the first calendar year on record to exceed the 1.5 degree Celsius threshold established in the Paris Agreement as a preferred limit. The World Meteorological Organization confirmed that the decade 2015-2024 was the warmest on record, with each of the 10 years ranking among the 10 hottest years since instrumental records began. The rate of warming has accelerated: the past 50 years of warming has occurred at twice the rate of the previous 50 years, per NASA's GISS Surface Temperature Analysis. Current trajectories, under existing national commitments, point to approximately 2.5-2.9 degrees Celsius of warming above pre-industrial levels by 2100.

What are current CO2 levels in the atmosphere?

Atmospheric CO2 concentration reached a new record high of approximately 426 parts per million (ppm) in May 2024, the annual peak month, according to NOAA's Mauna Loa Observatory — the longest continuous CO2 measurement record in the world, ongoing since 1958. Pre-industrial CO2 levels (circa 1750) were approximately 280 ppm. The current concentration represents approximately a 52% increase above the pre-industrial baseline. The annual rate of CO2 increase has itself been accelerating: the 1990s average was approximately 1.5 ppm per year; the 2010s averaged approximately 2.4 ppm per year; recent years show approximately 2.8-3.0 ppm annual increases. The last time Earth's atmosphere contained this much CO2 was approximately 3-5 million years ago, during the Pliocene Epoch, when global temperatures were approximately 2-3 degrees Celsius warmer and sea levels 15-25 meters higher.

How has extreme weather frequency and cost changed?

Extreme weather events attributable to climate change have become measurably more frequent and costly. Munich Re's 2025 Natural Catastrophe Report documented global economic losses from natural catastrophes of approximately \(320 billion in 2024 — the second-highest annual total on record — with insured losses reaching \)140 billion. The United States has averaged approximately 23 billion-dollar weather disasters per year since 2020, compared to 6.6 per year in the 1980s, per NOAA's Billion-Dollar Weather and Climate Disasters database. Attribution science — the field that estimates how much climate change affected the probability of specific weather events — has matured significantly; multiple studies have found that 2024 European heat waves were made 2-5x more likely by climate change, and 2023-2024 US flood events showed similar amplification.

How fast is renewable energy growing?

Renewable energy has grown faster than nearly all expert forecasts. The International Energy Agency's 2025 Renewables report documented that solar PV capacity grew by approximately 593 GW in 2024 — more than all other electricity generation sources combined. Global renewable electricity capacity exceeded 4,000 GW in 2025, with solar and wind each contributing over 1,000 GW. Renewables now generate approximately 30% of global electricity, up from 22% in 2020. Solar panel prices have fallen approximately 90% since 2010, making solar the cheapest electricity source in history in most markets. The IEA's World Energy Outlook 2024 found that, for the first time, global demand for all fossil fuels — oil, gas, and coal — is projected to peak before 2030 under current policy trajectories.

Which countries emit the most CO2?

Global Energy Monitor and the Global Carbon Project's 2024 data identifies China as the world's largest CO2 emitter, responsible for approximately 31% of global CO2 emissions. The United States is second at approximately 14%, followed by India (7%), the European Union collectively (7%), and Russia (5%). These five together account for approximately 64% of all global CO2 emissions. On a per-capita basis, the ranking differs substantially: Qatar, Kuwait, and the UAE show the highest per-capita emissions globally, exceeding 25 tonnes CO2 per person annually. The United States averages approximately 14 tonnes per person, China approximately 9 tonnes, the EU approximately 7 tonnes, and India approximately 2 tonnes. Historically, the United States and EU bear the largest responsibility for cumulative atmospheric CO2 accumulation, having industrialized earlier.

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