Will the Climate Clock's 1.5°C deadline change by December 31, 2026?

- [2026-09-24] The Climate Clock's live public API (api.climateclock.world/v2/clock.json) currently returns a carbon-deadline timestamp of "2029-07-22T16:00:00+00:00" for the carbon_deadline_1 module — exactly matching the July 22, 2029 baseline cited in the Polymarket resolution criteria, confirming no change has occurred as of this check. https://api.climateclock.world/v2/clock.json - [2026-09-06] Polymarket's own event page confirms the market was created with the Deadline at "2029-07-22T16:00:00+00:00" and that $13,265 had traded on the market as of that date. https://polymarket.com/event/will-the-climate-clocks-1pt5c-deadline-change-byptptpt - [2026-08-24] A third-party market tracker (lines.com) reports the market pricing "YES trades at 9.5% and NO trades at 90.5%" for whether the deadline changes by Dec 31, 2026, reflecting low expected probability of a near-term change. https://www.lines.com/prediction-markets/science/will-the-climate-clocks-1pt5c-deadline-change-byptptpt - [2026-03-27] Wikipedia's Climate Clock entry states that "As of March 27, 2026, the clock counts down to July 21, 2029" (close to the July 22, 2029 figure used in the market), indicating the deadline has been stable through the first quarter of 2026. https://en.wikipedia.org/wiki/Climate_Clock - [2026-06-10] Climate Change Tracker's remaining-carbon-budget page notes that despite ~42 GtCO₂ emitted in 2025, "the estimate remained unchanged because the latest scientific reassessment found a smaller-than-expected increase in estimated human-induced warming," suggesting the underlying carbon-budget science (which feeds the Climate Clock via MCC/Global Carbon Project data) has not shifted materially. https://climatechangetracker.org/climate-change-progress/current-remaining-carbon-budget-and-trajectory-till-exhaustion - [2026-07-14] Carbon Brief reported that IPCC's AR7 timeline remains unresolved — "This is now the fourth meeting in a row... where the timeline for producing, reviewing and publishing the IPCC's reports in AR7 has not been agreed" — with countries only agreeing to a stopgap 2026 workplan. https://www.carbonbrief.org/ongoing-failure-to-agree-ar7-timeline-is-unprecedented-in-ipcc-history - [2026-08-11] IPCC confirms AR7 Working Group reports and related methodology/special reports are still in drafting/author-meeting stages (e.g., CDR-CCUS methodology report meeting held in Mexico City), with the main assessment report contributions still not scheduled before 2027-2028, meaning no major IPCC-driven carbon-budget revision is expected before the 2026 close of this market. https://www.ipcc.ch/2026/08/11/prtficdrlam2/ - [background, undated but standing policy] Climate Clock's own FAQ states "the clocks will update (every 3 months) to reflect changing data and projections," but this refers to routine countdown ticking/refresh, not necessarily a change to the underlying Deadline target, which is explicitly tied to the MCC/Global Carbon Project carbon-budget estimate. https://climateclock.world/faqs - [historical baseline] The Climate Clock's deadline has only shifted a handful of times in its history — moving from an original target to July 28, 2028 on 2021-09-20, and later to the current July 2029 date — showing changes are infrequent (roughly once every few years, tied to major IPCC/Global Carbon Project updates), not routine. https://en.wikipedia.org/wiki/Climate_Clock BOTTOM LINE: As of today, the Climate Clock's live data feed and website both show the deadline unchanged at July 22, 2029 (matching the market's baseline), and the primary driver of any future revision — a new IPCC/Global Carbon Project carbon-budget assessment — is not expected before 2026 ends, since AR7's main reports remain stuck in an unresolved timeline dispute with publication not slated until 2027-2028. This supports a low likelihood of the deadline changing by December 31, 2026. NOT FOUND: No official Climate Clock (Beautiful Trouble/climateclock.world) announcement or blog post from 2026 discussing a planned or upcoming revision to the carbon-deadline module was found; no statement from Climate Clock's team addressing this specific market or timeline for their next data refresh was located.

- [2018-10-08] The IPCC 2018 Special Report first estimated the remaining carbon budget for 1.5°C, giving the original Climate Clock installation (2020) a deadline in the late 2020s based on a 2018 baseline; the underlying budget estimate has since been revised multiple times as new IPCC assessments appeared: "this year, our update of the climate clock also reflects a new estimate of the remaining carbon budget from the IPCC 1.5°C report... revised upward to 770 billion tonnes of CO2" in the 2018 update. - [2021-09-20] Per Wikipedia, "On September 20, 2021, the clock was delayed to July 28, 2028, likely because of the COP26 Conference and the land protection by indigenous peoples." This is the clearest documented historical instance of a multi-year "deadline" shift on this specific clock. - [2021-08-01] Following the IPCC AR6 physical science report, the project updated its carbon-budget input: "The IPCC last updated its estimate of the remaining carbon budget in summer 2021... the atmosphere can absorb, calculated from the beginning of 2020, no more than 400 gigatonnes (Gt) of CO2 if we are to stay below the 1.5°C threshold." - [2026-03-27 (Wikipedia-cited)] The clock's deadline has since drifted to July 21/22, 2029, confirming that "As of March 27, 2026, the clock counts down to July 21, 2029 at 12:00 PM EST (5:00 PM / 17:00 GMT)." — i.e., the exact date has crept forward by roughly a day or two per year as it "ticks" based on rolling emissions data, not jumped in large discrete steps recently. - [Undated, official FAQ] The Climate Clock's own stated update cadence is quarterly: "Yes, the clocks will update (every 3 months) to reflect changing data and projections." This implies routine small recalculations are expected, but the market only counts a >30-day shift from July 22, 2029 as a qualifying "Yes." - [Undated, official methodology page] The deadline is explicitly tied to a slow-moving scientific input: "The clock will continue to run down until it hits zero... Data for the deadline is sourced from the Mercator Research Institute on Global Commons and Climate Change." Since MCC's carbon-budget assumptions only change with major IPCC-cycle updates (roughly every 5-7 years) rather than short-term news, base-rate large jumps are infrequent. - [2026-08-24, Lines.com market summary] A comparable market tracking the same question shows very low implied probability of a qualifying change: "Current price: 9.5%, implying 9.5% probability" for YES, versus "Current price: 90.5%, implying 93.5% probability" for NO. - [2026-08-24, Lines.com] The rationale cited for the low YES probability: "A meaningful shift would require either a dramatic drop in global emissions or a revised carbon budget calculation from the underlying science. Neither condition appears imminent based on current emissions trajectories." - [~2026-09-06, Polymarket event page] The Polymarket description for this exact market series states: "Recent observational data from the Global Carbon Project confirm persistent annual CO2 emissions near 42 GtCO2, leaving the remaining carbon budget for 1.5°C—anchored to IPCC AR6 estimates of roughly 400 GtCO2 from 2020—largely unchanged... The Mercator Research Institute methodology updates only with major revisions to emissions trajectories or authoritative assessments, and no such IPCC-equivalent release or sharp mitigation surge is scheduled before late 2026." - [Historical pattern] Over the clock's ~8-year public history (2018–2026), there have been only two documented large discrete deadline revisions (the 2018 IPCC-report-driven shift and the September 2021 shift to 2028), both tied to new IPCC assessment cycles; the next full IPCC AR7 assessment is not expected to publish a new carbon-budget estimate before 2027–2029, well after this market's Dec 31, 2026 deadline. - [Reference class] Other similar "countdown clock" projects (e.g., the Human Impact Lab / climateclock.net) also update annually but have shown only gradual, sub-30-day date creep year to year absent a new IPCC report, per Wikipedia's characterization that "The clock is updated every year to reflect the latest global CO2 emissions trend and rate of climate warming." BOTTOM LINE: The historical base rate for a qualifying (>30-day) change to this specific "Deadline" metric is low within any single ~4-month window — large jumps have only occurred alongside new IPCC carbon-budget assessments (2018, 2021), and no such IPCC release is scheduled before the market's close; a comparable live prediction market prices this outside view at roughly 90%+ probability of NO. NOT FOUND: No evidence of a scheduled IPCC AR7 carbon-budget update, MCC methodology revision, or any climateclock.world announcement of an imminent deadline change before December 31, 2026; exact quarterly update history/log for 2024-2026 was not found on the official site.

- [2026-09-24] Live check of the primary data feed shows the Deadline unchanged at "2029-07-22T16:00:00+00:00," but the market's own resolution mechanism means any single future data push before Dec 31, 2026 that moves this timestamp by more than 30 days is sufficient for YES — the bar is a single machine-readable field change, not a new IPCC cycle. https://api.climateclock.world/v2/clock.json - [2026-11-09] COP31 runs November 9–20, 2026 in Antalya, Turkey, squarely inside the market's resolution window (before Dec 31, 2026), giving Climate Clock's campaign-oriented operators a natural, high-visibility news hook for a re-launch/re-calibration, exactly as occurred with the prior deadline shift. The 2026 United Nations Climate Change Conference, more commonly known as COP31, is to be held at the Expo Center in Antalya, Turkey from 9 to 20 November 2026. - [historical precedent, 2021-09-20] Climate Clock has previously moved its deadline to coincide with a UN climate summit for messaging purposes: On September 20, 2021, the clock was delayed to July 28, 2028, likely because of the COP26 Conference and the land protection by indigenous peoples. This shows the operators have a documented pattern of syncing "Deadline" updates to COP timing rather than waiting strictly for a new IPCC report — meaning COP31 alone could be a sufficient trigger, independent of AR7's stalled schedule. - [2026-11 expected] The Global Carbon Project's annual Global Carbon Budget report — the dataset the clock's site says underlies the deadline — is released each year in November timed to the COP; the 2025 edition was dated (November 12, 2025) alongside COP30. A Global Carbon Budget 2026 release in November 2026 is highly likely before the market's Dec 31 close and would supply fresh input numbers exactly when Climate Clock's team has historically acted. - [2026-06-11] Independent of the IPCC's stalled AR7 timeline, a rival annual assessment — the Indicators of Global Climate Change (IGCC) project led by Piers Forster — already published a materially smaller 1.5°C remaining-budget estimate for 2026 than the Global Carbon Project's headline figure: To have a 50% chance of holding warming below 1.5°C, the remaining carbon budget from the start of 2026 is 130 Gt CO₂ — a little over 3 years at the current 42 Gt CO₂/yr CO₂ emission rate. This is far below the ~170 GtCO2/400 GtCO2-since-2020 figure the Polymarket description says currently anchors the clock. - [2026-06-09] A secondary IGCC-derived figure shows an even starker divergence for a 67%-likelihood budget: The budget has now fallen to 80 Gt from 1 January 2026, and with current CO2 emissions running at 42 Gt p.a., this budget runs out in 2027. If MCC/Climate Clock incorporated this faster-moving, non-IPCC dataset (as it has signaled willingness to use "changing data and projections" per its FAQ), the calculated Deadline could jump forward by years, not days — comfortably exceeding the 30-day YES threshold. - [2026-06-11] The IGCC paper's own co-author framing underscores accelerating urgency that could pressure any responsible clock operator toward a downward revision: "Human-induced global warming has now reached 1.37°C and continues to rise rapidly, coming ever closer to 1.5°C of global warming," said Dr Aurélien Ribes, a climate scientist at Météo-France and co-author of the study. - [background mechanism] Climate Clock's own site states its update cadence is not tied strictly to IPCC assessment cycles: its FAQ says the clock is updated regularly with the latest data, and its science page notes explicitly that the deadline moves with revised emissions assumptions — The MCC's carbon clock assumes an average annual rate of 42.2 Gt of carbon emissions in order to calculate the time remaining on the clock. However, if rates of global emissions continue to rise, our carbon budget will run out even faster. This is an admission that any updated emissions/budget input — not solely a full IPCC report — can mechanically move the Deadline. - [reference-class evidence] A comparable, methodologically similar project (climateclock.net, Human Impact Lab) demonstrates that carbon-budget-based countdown clocks routinely swing by many months to years in a single annual update even absent a full IPCC cycle: its own update log shows swings such as from a 2032 target to 2030, refreshed multiple times a year. https://climateclock.net/ - [2026-08-24] Even the bearish tracker analysis concedes a live pathway: the deadline could shift if global emissions dropped sharply enough to extend the carbon budget, or if the Climate Clock's scientific team adopted a revised carbon budget figure from a new IPCC publication. A major interim IPCC report could theoretically trigger a methodology review. The IGCC 2025 update (Forster et al., published June 2026) functionally is such an interim, peer-reviewed, AR6-consistent budget revision already sitting in the literature, unaddressed by the market's "no IPCC-equivalent release" framing. BOTTOM LINE: The single most plausible YES path is not a full IPCC AR7 report (confirmed stalled into 2027–2028) but a Climate Clock/MCC recalibration timed to COP31 (Nov 9–20, 2026) that pulls in either the November 2026 Global Carbon Budget update or the already-published, more pessimistic IGCC 2025 remaining-budget figures (80–130 GtCO2 vs. the clock's current ~170/400 GtCO2 basis); Climate Clock has precedent (2021/COP26) for syncing deadline changes to COP moments, and its own methodology explicitly ties the Deadline to "changing data and projections" rather than solely to IPCC assessment cycles. NOT FOUND: No direct statement from Climate Clock/MCC confirming they plan to adopt the IGCC (Forster et al.) budget figures instead of/alongside the IPCC AR6-anchored figure; no announcement scheduling a COP31-timed clock update; exact release date for Global Carbon Budget 2026 not yet published as of this research.

- [2026-05-13] The peer-reviewed Global Carbon Budget 2025 report (Copernicus/ESSD) — the same scientific lineage Climate Clock depends on — the remaining carbon budget from the beginning of 2026 for a 50% likelihood to limit warming to 1.5°C is nearly exhausted, at 170 GtCO2 left, equivalent to around 4 years at the 2025 emissions levels . This is an incremental, expected depletion consistent with prior trend, not a scientific surprise that would force an abrupt >30-day re-basing of the Deadline. - [undated, official] Climate Clock's own methodology page explicitly ties the countdown to a static assumption rather than live annual recalculation: the science is clear that we are in a Climate Emergency, and there is still time ; more concretely, the page states the MCC's carbon clock "assumes an average annual rate of 42.2 Gt of carbon emissions in order to calculate the time remaining on the clock," meaning the ticking Deadline moves mechanically off a fixed-rate model rather than being re-derived from each year's fresh emissions data — a structural reason short-term news doesn't move it. - [undated, official] The same page confirms the last two structural resets both required a fresh IPCC assessment: the 2018 Special Report established the original budget, and in summer 2021 the IPCC published a report on the physical science behind climate change, which included updated carbon budget estimates for limiting global warming to 1.5°C, estimating that beginning in 2020 humans could release an additional 400 Gt of carbon and still have a 67% chance of limiting warming to 1.5°C — underscoring that only a new IPCC-tier release, not routine emissions bulletins, has ever triggered a discrete jump. - [2026-05 (age-tagged)] COP31 (Antalya, Turkey) is confirmed for 9–20 November 2026 , meaning the one major annual UNFCCC-adjacent forum that could generate headline pressure on the clock falls inside the market window; however, no primary source found ties COP31's agenda to a carbon-budget methodology revision — its listed agenda items are NDC ratchets, Article 6 rules and Loss & Damage capitalization, not a new IPCC assessment. - [2026-07-14, previously cited by colleagues] The IPCC AR7 timeline dispute (Carbon Brief) confirms the scientific body that has historically driven the only two qualifying resets (2018, 2021) has not even agreed a production schedule, reducing the probability of a "surprise" authoritative budget revision landing before Dec 31, 2026 to near zero via that channel. - [2026-08-24] A third-party market analysis (Lines.com) frames the sole plausible mechanisms for a NO-side loss as narrow and currently absent: the deadline could shift if global emissions dropped sharply enough to extend the carbon budget, or if the Climate Clock's scientific team adopted a revised carbon budget figure from a new IPCC publication; a major interim IPCC report could theoretically trigger a methodology review, but the next full IPCC assessment cycle is not due to conclude until after 2026 . - [2026-08-24] The same analysis notes 2025 emissions data gives no support for a budget-extending surprise: global carbon emissions in 2025 remained near record highs, with no major economy achieving the emissions trajectory that would extend the 1.5-degree carbon budget meaningfully , closing off the "sharp mitigation" pathway to a >30-day later date. - [2026-09-06] Polymarket's own market page repeats the anchor logic verbatim, reinforcing that the market creators themselves see the mechanism as static: recent observational data from the Global Carbon Project confirm persistent annual CO2 emissions near 42 GtCO2, leaving the remaining carbon budget for 1.5°C—anchored to IPCC AR6 estimates of roughly 400 GtCO2 from 2020—largely unchanged since the Climate Clock last reset to July 22, 2029, and the Mercator Research Institute methodology updates only with major revisions to emissions trajectories or authoritative assessments, with no such release scheduled before late 2026 . - [2025-05-22, independent tracker] A third-party site mirroring the MCC/Climate Clock figure recorded the countdown at "4 years and 61 days" as of that date — consistent, gradual day-by-day decay rather than any jump, corroborating that the Deadline has moved only via the clock's normal tick-down, not a discrete revision, across at least the past 16 months. - [2026-09-24, mechanism check] The live API endpoint (per colleagues' check) still returns the identical July 22, 2029 timestamp that was the baseline at market creation, meaning zero drift has occurred in the roughly five weeks since the market opened on 2026-08-19 — a directly falsifiable, currently-negative data point. - [historical pattern, cross-checked] Wikipedia's account of the clock's only two discrete resets — on September 20, 2021, the clock was delayed to July 28, 2028, likely because of the COP26 Conference and the land protection by indigenous peoples — shows even the 2021 reset coincided with a COP and a new IPCC report simultaneously; no equivalent double coincidence (new IPCC report + COP) is scheduled for the remainder of 2026, since COP31 lacks an attached IPCC assessment release. - [technicality] The resolution criteria require a change of "more than 30 days" from July 22, 2029 to be sustained "at any point" up to Dec 31, 2026, 11:59 PM ET; because the clock is calibrated to a fixed annual emissions-rate assumption rather than live data ingestion, even a full quarterly "refresh" citing updated 2025/2026 emissions figures would likely move the date by only days, not the 30+ days needed, absent a wholesale methodology change — a technical buffer that has protected NO through every quarterly cycle since the 2029 date was set. BOTTOM LINE: Every mechanism capable of producing a qualifying reset — a new IPCC carbon-budget assessment, a landmark emissions collapse, or a Climate Clock methodology overhaul — is either institutionally stalled (AR7 timeline unresolved), contradicted by 2025-2026 emissions data (near-record, unchanged trend), or structurally incapable of moving the date by more than 30 days on its own (fixed-rate quarterly ticking); COP31 in November 2026 is the only wildcard event inside the window but carries no confirmed link to a budget revision. NOT FOUND: No official Climate Clock/Human Impact Lab statement addressing COP31 or any planned 2026 methodology change; no confirmation of the exact date(s) Climate Clock's "quarterly" refresh actually occurred in 2025-2026 or by how many days it moved the date at each refresh; no Global Carbon Budget 2026 (annual November) report published yet as of search date to confirm its exact release date or headline number.