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    Climate science and carbon removal in 2026: a crash course

    Human activity has warmed the planet by about 1.37 °C, and at current emissions the budget for holding warming to 1.5 °C runs out in roughly three years.[1][2] Every scenario that reaches net zero and halts warming also needs carbon dioxide removal at gigatonne scale, yet in 2025 novel removal methods delivered only about 2 million tonnes, which makes scaling them credibly the field's central challenge.[3][4]

    Editor reviewedUpdated Climate science and carbon removalEnergy and climateScience

    Why the field matters

    The world is getting hotter because of greenhouse gases from burning fossil fuels and clearing land. The IPCC, the UN’s climate science panel, concluded in 2021 that it is “unequivocal” that humans have warmed the planet.[5] In 2025 the planet was about 1.44 °C warmer than in 1850–1900, and the eleven years from 2015 to 2025 were the eleven hottest on record.[6][7]

    Cutting emissions is the main fix, but it is no longer enough on its own. To stop warming, the world must also pull some CO2 back out of the air, which is called carbon dioxide removal (CDR).[3]

    The Indicators of Global Climate Change 2025 study puts human-induced warming at 1.37 °C in 2025, rising about 0.27 °C per decade, and the central 1.5 °C budget at 130 GtCO2 from the start of 2026.[1][2] Fossil CO2 emissions reached a projected 38.1 GtCO2 in 2025, and atmospheric CO2 about 425.7 ppm.[8][9] In Paris-compatible pathways emissions cuts provide at least 80% of the effort to reach net zero CO2, but all pathways that halt warming deploy CDR at gigatonne scale.[3]

    Map of the field

    The field has two halves that feed each other.

    Climate science measures and explains change:

    Carbon removal tries to reverse part of the cause:

    Solar geoengineering, which would reflect sunlight instead of removing CO2, sits beside the field as a contested research area.[17]

    Key ideas

    1. Warming tracks cumulative CO2. Each 1,000 billion tonnes of CO2 likely adds 0.27–0.63 °C of warming, which is why a finite carbon budget can be calculated.[12]
    2. The ocean holds most of the extra heat. About 90% of excess heat goes into the ocean, whose heat content reached a record in 2025.[18][19]
    3. Some changes may be abrupt. The 2025 Global Tipping Points Report concluded warm-water coral reefs are passing their tipping point.[20]
    4. Durability and measurement define removal quality. The most common storage threshold in standards is 100 years, the EU requires “several centuries” for permanent removal, and some methods are hard to measure.[21][16]
    5. Costs vary enormously. Removal costs range from under $10 to over $1,000 per tonne depending on method.[22]

    Who the main players are

    • Science assessors and data providers. The ipcc assesses the literature; WMO, Copernicus and the Global Carbon Project publish annual indicators.[23][6][24][8]
    • Attribution groups. World Weather Attribution runs rapid studies of extreme events with partners including Imperial College London and KNMI.[25]
    • Removal developers. climeworks runs the Mammoth direct air capture plant in Iceland; Occidental’s 1PointFive is building the larger STRATOS plant in Texas; Stockholm Exergi is building a large BECCS plant.[26][27][28]
    • Buyers. Microsoft dominates purchases, and the frontier-carbon-removal coalition of Stripe, Google, Shopify, Anthropic and others has committed $1.8 billion.[29][30]

    The frontier in October 2026

    • Warming at the 1.5 °C line. 2023–2025 was the first three-year period to average more than 1.5 °C in ERA5, and human-induced warming is projected to pass 1.5 °C in about four years.[31][32]
    • IPCC timeline stalemate. Governments have not agreed when AR7’s main reports will appear; the 65th session opens on 12 October 2026.[33][34]
    • Direct air capture’s proving year. Climeworks reported doubled capture in upgraded Mammoth units, while STRATOS was delayed again in May 2026.[35][36]
    • Demand shock. Microsoft was reported in April 2026 to be pausing new removal purchases, and the State of CDR report calls demand expectations fragile.[37][38]
    • Ocean and rock methods move into the field. The first EPA-permitted ocean alkalinity trial reported no measurable harm to marine life, while verified enhanced weathering tonnage stays small.[39][40]

    Where to go next:

    Questions readers ask

    How much has the Earth warmed?

    WMO put 2025 at 1.44 °C above the 1850–1900 average, and the 2025 indicators study estimated human-induced warming at 1.37 °C.[6][1]

    Is it too late for 1.5 °C?

    The central estimate of the remaining 1.5 °C budget was 130 billion tonnes of CO2 from the start of 2026, about three years of current emissions, and Copernicus said human-induced warming is projected to pass 1.5 °C in about four years.[2][32]

    What is carbon dioxide removal?

    Human activities that capture CO2 from the atmosphere and store it durably in geological, land or ocean reservoirs, or in products. About 2.2 billion tonnes a year are removed today, almost all by forests and soils.[41][14]

    Which carbon removal methods are biggest?

    Among novel methods, biochar removed about 1.46 million tonnes in 2025 and BECCS about 0.51 million tonnes; direct air capture removed about 1,500 tonnes.[42][43][44]

    Who pays for carbon removal?

    Mostly voluntary corporate buyers. Microsoft accounted for 78.5% of disclosed durable removal purchases as of April 2026, and the Frontier coalition has committed $1.8 billion.[29][30]

    Sources

    Each numbered claim is a statement we checked against the sources listed with it. Status shows how well established it is.

    1. [1]

      The Indicators of Global Climate Change 2025 study estimated human-induced warming at 1.37 °C above 1850–1900 in 2025, rising at about 0.27 °C per decade over 2016–2025. confirmedas of 2026-06-11

    2. [2]

      The Indicators of Global Climate Change 2025 study put the central estimate of the remaining carbon budget for keeping warming below 1.5 °C at 130 billion tonnes of CO2 from the start of 2026, enough for about three years of current emissions. confirmedas of 2026-06-11

    3. [3]

      All scenarios that reach net zero and halt warming deploy CDR at gigatonne scale, while in cost-effective Paris-compatible scenarios emissions cuts provide at least 80% of the effort to reach net zero CO2. confirmedas of 2026-06-01

    4. [4]

      Removal from novel methods grew from 1.4 million tonnes of CO2 in 2023 to 2.0 million tonnes in 2025. confirmedas of 2026-06-01

    5. [5]

      The IPCC's Sixth Assessment Report states that it is unequivocal that human influence has warmed the atmosphere, ocean and land. confirmedas of 2021-08-09

    6. [6]

      WMO's consolidation of eight datasets put 2025 at 1.44 °C (±0.13 °C) above the 1850–1900 average, the second or third warmest year on record depending on the dataset. confirmedas of 2026-01-14

    7. [7]

      The eleven years 2015–2025 are the eleven warmest on record in all eight datasets WMO uses. confirmedas of 2026-01-14

    8. [8]

      The Global Carbon Budget 2025 projected record fossil CO2 emissions of 38.1 billion tonnes in 2025, up 1.1% on 2024. confirmedas of 2025-11-13

    9. [9]

      The Global Carbon Budget 2025 projected atmospheric CO2 at 425.7 ppm in 2025, 52% above pre-industrial levels. confirmedas of 2025-11-13

    10. [10]

      WMO's State of the Global Climate 2025 reported that Earth's energy imbalance, which has increased since its observational record began in 1960, reached a new high in 2025. confirmedas of 2026-03-23

    11. [11]

      NOAA lists the uses of climate models as controlled experiments on parts of the climate system, detection and attribution of climate changes, and projections from seasons to centuries ahead. confirmedas of 2026-10-10

      • Climate Modeling · NOAA Geophysical Fluid Dynamics Laboratory · Uses of climate models (retrieved 2026-10-10)
    12. [12]

      The IPCC found a near-linear relationship between cumulative CO2 emissions and warming, with each 1,000 billion tonnes of CO2 likely causing 0.27–0.63 °C of warming (best estimate 0.45 °C). confirmedas of 2021-08-09

    13. [13]

      The IPCC states with high confidence that abrupt responses and tipping points, such as strongly increased Antarctic ice-sheet melt and forest dieback, cannot be ruled out. confirmedas of 2021-08-09

    14. [14]

      Total carbon removal is about 2.2 billion tonnes of CO2 a year, around 5% of gross CO2 emissions; conventional methods provide 99.9% and novel methods about 2 million tonnes, growing about 40% a year. confirmedas of 2026-06-01

    15. [15]

      The State of CDR report splits removal into "conventional" methods, largely forests and soils, and "novel" methods such as biochar, enhanced weathering and direct air carbon capture and storage. confirmedas of 2026-06-01

    16. [16]

      The State of CDR report lists open problems for novel CDR quality, including sustainable biomass sourcing for BECCS and biochar, permanence of storage, measurement of enhanced weathering and ocean alkalinity enhancement, and lifecycle emissions of energy-intensive DACCS. confirmedas of 2026-06-01

    17. [17]

      The US National Academies describe solar geoengineering as cooling the Earth by adding reflective particles to the upper atmosphere, brightening low clouds or thinning high-altitude clouds that trap heat. confirmedas of 2021-03-25

    18. [18]

      About 90% of the excess heat trapped by greenhouse gases is absorbed by the ocean, which makes ocean heat content a key indicator of climate change. confirmedas of 2026-01-14

    19. [19]

      Ocean heat content in the upper 2,000 metres reached its highest level since records began in 1960, according to WMO. confirmedas of 2026-03-23

    20. [20]

      The Global Tipping Points Report 2025 concluded that warm-water coral reefs are passing their thermal tipping point, with a central threshold estimate of 1.2 °C (range 1–1.5 °C), making it the first Earth system tipping point reached. reportedas of 2025-10-10· interpretation

    21. [21]

      Storage-duration rules differ widely; the most common threshold among standards is 100 years, the EU's CRCF regulation defines permanent removal as storage for "several centuries", and the UK ETS requires 200 years for removal credits. confirmedas of 2026-06-01

    22. [22]

      Expected removal costs range from under $10 to over $1,000 per tonne, and most methods have upper cost estimates above $200 per tonne, well above current carbon prices. confirmedas of 2026-06-01

    23. [23]

      The IPCC is the UN body for assessing the science related to climate change, established by UNEP and the World Meteorological Organization in 1988. confirmedas of 2026-10-08

    24. [24]

      In the Copernicus ERA5 dataset, 2025 was 1.47 °C above pre-industrial, the third warmest year, after 2024 at 1.60 °C, the warmest on record. confirmedas of 2026-01-14

    25. [25]

      World Weather Attribution was set up in 2014 and works with Imperial College London, the Royal Netherlands Meteorological Institute (KNMI) and the Red Cross Red Crescent Climate Centre. confirmedas of 2026-10-10

    26. [26]

      Climeworks' Mammoth plant at Hellisheiði, Iceland started operations on 8 May 2024, with 12 of its 72 collector containers installed, and has a nameplate capacity of up to 36,000 tonnes of CO2 a year, about ten times its predecessor Orca. confirmedas of 2024-05-08

    27. [27]

      Occidental's 1PointFive STRATOS plant in the Texas Permian Basin is designed to capture up to 500,000 tonnes of CO2 a year, with Class VI permits for three wells to store about 722,000 tonnes a year in saline formations. confirmedas of 2026-03-03

    28. [28]

      Sweden approved just over SEK 20 billion in support for Stockholm Exergi's BECCS plant, paid over up to 15 years from the start of geological storage, which is planned for 2028. confirmedas of 2026-06-01

    29. [29]

      Microsoft accounted for 78.5% of all disclosed durable carbon removal tonnes purchased as of April 2026, according to CDR.fyi. confirmedas of 2026-06-12

    30. [30]

      In June 2026 Frontier announced $915 million in new commitments, bringing its total to $1.8 billion of permanent carbon removal by 2040, and Anthropic joined as a buyer. confirmedas of 2026-06-23

    31. [31]

      According to Copernicus, 2023–2025 was the first three-year period whose average temperature exceeded 1.5 °C above the 1850–1900 level. confirmedas of 2026-01-14

    32. [32]

      Copernicus, summarising the 2025 indicators study, said human-induced warming is projected to pass 1.5 °C in about four years. reportedas of 2026-06-11· forecast

    33. [33]

      At its 64th session in Bangkok, which closed on 27 March 2026, the IPCC made no formal decision on the timeline of its Seventh Assessment Report, though governments said they want it agreed at the next session. confirmedas of 2026-03-27

    34. [34]

      The IPCC's 65th plenary session is scheduled for 12–16 October 2026 in Addis Ababa, Ethiopia. confirmedas of 2026-10-08

    35. [35]

      On 10 September 2026 Climeworks said sorbent and plant upgrades had more than doubled CO2 capture in upgraded collector containers at Mammoth and cut operating costs per tonne by more than 50%. confirmedas of 2026-09-10

    36. [36]

      In May 2026 Occidental said STRATOS, first planned to operate by the end of 2024, had hit an unexpected delay from component issues after its core process units performed as expected in testing. E&E News noted the plant is designed for 500,000 tonnes a year, against 36,000 tonnes for the largest DAC plant then operating. confirmedas of 2026-05-07

    37. [37]

      In April 2026 Heatmap News and Bloomberg reported that Microsoft was pausing future carbon removal purchases; Microsoft said it may "adjust the pace or volume" of its procurement. confirmedas of 2026-04-16

    38. [38]

      The State of CDR report says expectations of large and growing demand for CDR have become fragile, and prices in nascent compliance markets are low compared with current costs for many methods. confirmedas of 2026-06-01· interpretation

    39. [39]

      Preliminary LOC-NESS results released in February 2026 showed the surface ocean taking up carbon from the atmosphere and no measurable impact on monitored ocean life. WHOI says part of the CO2 uptake will be quantified in upcoming peer-reviewed publications. confirmedas of 2026-02-25

    40. [40]

      Verifiable enhanced weathering removals totalled about 0.0038 million tonnes of CO2 in 2025 under a stricter counting method, even as companies spread tens of thousands of tonnes of basalt in India and Brazil. confirmedas of 2026-06-01

    41. [41]

      Carbon dioxide removal (CDR) means human activities that capture CO2 from the atmosphere and store it durably in geological, land or ocean reservoirs, or in products. confirmedas of 2026-06-01

    42. [42]

      Biochar removed an estimated 1.46 million tonnes of CO2 in 2025, nearly three-quarters of all novel removal. confirmedas of 2026-06-01

    43. [43]

      BECCS removed about 0.51 million tonnes of CO2 in 2025 from three operating facilities, all US ethanol plants. confirmedas of 2026-06-01

    44. [44]

      Direct air capture with storage removed about 0.0015 million tonnes (roughly 1,500 tonnes) of CO2 in 2025, with Climeworks' Orca and Mammoth both still running below full capacity. confirmedas of 2026-06-01

    Revision history (1)
    1. Page created.

    Created Oct 10, 2026. Last reviewed by an editor on Oct 10, 2026. Next scheduled review: Jan 10, 2027.

    Cite this page

    "Climate science and carbon removal in 2026: a crash course." ContentLora, updated Oct 10, 2026. https://contentlora.com/explain/climate-carbon-removal

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