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Will the world pass 2 degrees Celsius over pre-industrial levels before 2050?

KXWARMING-50 · Climate and Weather · 2026-05-16
74%
Agent
76%
Market Price
-2.0%
Edge
50%
Confidence
Volume: 13,338
Spread: 2.0c
Days to resolution: 8630
Markets in event: 1
Final Rationale
My independent estimate of 72% was anchored on a forced warming trend of ~0.22°C/decade from a 2024 anchor of ~1.55°C, which projects trend crossing of 2.0°C around 2044-2045 with additional El Niño excursion opportunities in the 24-year window. I partially accept the Devil's Advocate's critique on ensemble homogeneity (genuine contrarian views exist around HadCRUT running cooler and potential La Niña/volcanic forcing) and on double-counting ENSO in the 2024 anchor — these push slightly downward. However, I accept Challenge 1's point that resolution likely allows any major dataset's annual mean, which favors crossing (ERA5 already at ~1.6°C in 2024 means only ~0.4°C more needed in 24 years with a strong El Niño), pushing slightly upward. These largely offset, and the market at 76% with shallow liquidity and a downward drift sits within noise of my estimate, so I converge modestly to 74%.
Price vs. prediction
How the market moved after the agent's call. Solid blue line is the actual market price; dashed line is the agent's static forecast at $t{=}0$.
$n = 58$ follow-ups
Re-scan Context
This market has been scanned before. Previous predictions:
DatePredictedMarket PriceConfidence
2026-05-08 71% 76% 55%
2026-05-01 78% 80% 55%
2026-04-06 68% 81% 45%
1. Planner Opus · Fermi decomposition + tool plan
Tools chosen: article_search kalshi_data
Sub-questions (Fermi decomposition)
  1. Will the world pass 2 degrees Celsius over pre-industrial levels before 2050? (w=1.00)
Planner reasoning
Fallback: general forecasting approach
2. Research Parallel tool calls · legacy v2
ToolStatusTimeItemsSummary
article_search OK 0.3s -
kalshi_data OK 2.1s -
3. Evidence Synthesis Sonnet · 3 items · legacy v2
#StrengthCredibilityDirectionSourceClaimPriced In
1 MODERATE 62 ↑ UP kalshi_data The Kalshi prediction market (KXWARMING-50) currently prices the probability of global temperatures passing 2°C before 2050 at 76%, down 4% over the past 30 days but up 1% over the past 7 days. Yes
2 MODERATE 72 ↑ UP article_search Extreme heat records were shattered across the U.S. West in March 2026, with Phoenix recording its hottest March ever and a new national March temperature record of 112°F set in Arizona, attributed in part to human-caused climate change. Yes
3 MODERATE 74 ↑ UP article_search World Weather Attribution research states the extreme March 2026 heat across the U.S. West would have been 'virtually impossible' without human-caused climate change, reinforcing the ongoing acceleration of warming trends. Yes
Information Gaps
  • No direct data on current global mean surface temperature anomaly relative to 1850-1900 baseline for 2025 or 2026
  • No IPCC or WMO projections cited regarding the specific probability or timeline for annual mean temperature crossing +2.0°C
  • No data on recent CO2 emissions trajectories or pledged mitigation policies that would affect the warming pace
  • No data on El Niño/La Niña cycle forecasts for 2026–2050, which significantly affect year-to-year temperature anomalies
  • No scientific model ensemble outputs or expert assessments specifically targeting the pre-2050 threshold crossing probability
  • No information on the 2024 or 2025 annual global mean temperature anomaly values, which are critical baseline data points
  • No data on whether any year has already approached or exceeded +1.8°C or +1.9°C annually, indicating proximity to the threshold
Key Uncertainties
  • Whether a single exceptionally warm year (e.g., driven by a strong El Niño) could temporarily push annual mean temperatures above +2.0°C before underlying forced warming reaches that level
  • The exact definition and dataset used to measure the 'annual global mean surface temperature anomaly' — different datasets (HadCRUT, GISTEMP, Berkeley Earth, ERA5) yield slightly different values
  • The pace of decarbonization globally and whether any breakthrough policies or technologies could significantly slow warming in the 2030–2050 window
  • The role of aerosol masking: if industrial emissions fall rapidly, reduced sulfate aerosols could cause a near-term warming spike
  • Tipping point dynamics that could accelerate warming non-linearly (Arctic sea ice loss, permafrost methane release)
  • Whether a strong La Niña in the coming years could push annual temperatures back down, delaying the threshold crossing even as the long-term trend continues upward
Market Context
Price: 0.76 · 7d: +0.01 · 30d: -0.04
Volume: LOW — approximately 69 contracts per day is very thin for a major forecasting question · Depth: SHALLOW — limited price range data and low volume suggest a thin market
Reliability: LOW-MEDIUM — the market provides a directional signal at 76% YES, but the thin volume and limited trader participation reduce confidence in this as a precise probability estimate; the 30-day downward drift from ~80% to 76% may reflect updated climate data or simply low-liquidity noise
4. Independent Forecaster Opus · No market price · legacy v2 Did NOT see market price
Independent estimate: 72% (52% confidence)
base rate
72%
50% conf
evidence driven
72%
55% conf
contrarian
72%
50% conf
Spread
0pp
Low disagreement
sq1: Will the world pass 2 degrees Celsius over pre-industrial levels before 2050?
72%
Base rate framing: 2024 was the first calendar year to exceed +1.5°C (ERA5 showed ~1.55-1.6°C), and 2023 was ~1.45°C. The underlying forced warming trend is ~0.20-0.25°C per decade and arguably accelerating (post-2010 trend higher than 20th century). From a 2024 anchor of ~1.55°C, linear extrapolation at 0.22°C/decade reaches ~2.0°C around 2044-2045, giving 5+ years of window for single-year El Niño excursions to push annual means above +2.0°C. Historical El Niño-driven single-year excursions add 0.1-0.2°C above trend (e.g., 2023-24 was ~0.2°C above the smoothed trend). With 4-6 El Niño events expected between now and 2050, multiple 'shots on goal' exist. Evidence updates: The March 2026 extreme heat events are weak/moderate confirmation that warming continues but are regional and already priced into trend estimates (~0% net update). Downside risks: La Niña years could delay crossing; aerosol cleanup effects are uncertain; question requires annual (not monthly) anomaly crossing, which is a higher bar. Dataset choice matters — HadCRUT runs slightly cooler than ERA5/GISTEMP, and the question doesn't specify dataset. Net: forced warming likely reaches ~1.9-2.0°C by late 2040s; combined with El Niño excursions, probability of at least one annual crossing before 2050 is high but not certain. Estimate 72%.
Show full reasoning trace
base rate: No prior calendar year has reached +2.0°C; 2024 was the first to cross +1.5°C at ~1.55°C. Reference class: trend warming of 0.20-0.25°C/decade with single-year ENSO excursions of ±0.1-0.2°C.
evidence updates: March 2026 regional heat records reaffirm continued warming but are already implied by the trend (~0% update). Lack of explicit data on 2025 annual anomaly adds uncertainty.
combination method: Single sub-question, no combination needed.
final: Forced trend reaches ~2.0°C around 2044-2045 from a 2024 baseline of ~1.55°C at 0.22°C/decade. Multiple El Niño-driven single-year excursions in the 24-year window provide additional crossing opportunities. Downside risks (dataset choice, La Niña, slower acceleration) keep estimate below 80%. Final: 72%.
ensemble: {'ensemble_count': 3, 'perspectives': {'base_rate': {'p_yes': 0.72, 'confidence': 0.5}, 'evidence_driven': {'p_yes': 0.72, 'confidence': 0.55}, 'contrarian': {'p_yes': 0.72, 'confidence': 0.5}}, 'spread': 0.0, 'individual_p_yes': {'base_rate': 0.72, 'evidence_driven': 0.72, 'contrarian': 0.72}}
5. Devil's Advocate Sonnet · legacy v2 Market price revealed
Missing Info Reasoning Flaw
Challenges
  1. Question wording ambiguity not fully resolved: 'pass 2°C' could mean (a) a single annual mean crossing, (b) a sustained/smoothed crossing (IPCC definition uses 20-year averages), or (c) any monthly crossing. The forecaster assumes annual crossing but doesn't explore resolution criteria. If the question resolves on a single annual anomaly in any major dataset (ERA5/GISTEMP/Copernicus), probability should be HIGHER than 72%, since 2024 already hit ~1.6°C in ERA5 and a strong El Niño in the 2040s could easily push a year above 2.0°C. If it requires sustained crossing, probability should be LOWER.
  2. Ensemble shows zero spread (all three perspectives at exactly 0.72) — this is suspicious and suggests the 'contrarian' and 'base_rate' perspectives weren't genuinely independent. A real contrarian view would emphasize: aerosol forcing uncertainty going the OTHER way, possibility of major volcanic eruption, La Niña-dominated late 2020s, dataset choice (HadCRUT runs cooler). The lack of spread indicates anchoring rather than genuine ensemble reasoning.
  3. Linear extrapolation from a 2024 El Niño peak year may be biased upward. 2024's 1.55-1.6°C includes a substantial ENSO contribution (~0.1-0.2°C above trend). Using it as the trend anchor double-counts ENSO when later adding El Niño excursions. A cleaner trend anchor (e.g., 2020-2024 mean ~1.35°C) at 0.22°C/decade reaches 2.0°C closer to 2050, narrowing the window.
  4. Confidence of 0.517 seems low given the strength of the physical reasoning. The forecaster has good structural evidence but treats it as more uncertain than warranted — yet still arrives at 72%. Either the evidence supports higher confidence or the point estimate should be more hedged toward 50%.
Market comparison: Forecaster: 72%, Market: 76%. The 4-point divergence is well within noise for a low-liquidity market, and the market's 30-day drift from 80% to 76% suggests the market itself is uncertain. The forecaster's estimate is reasonable and the small gap doesn't indicate a reasoning error.
6. Aggregator Opus · final calibrated forecast
74% (50% confidence)
My independent estimate of 72% was anchored on a forced warming trend of ~0.22°C/decade from a 2024 anchor of ~1.55°C, which projects trend crossing of 2.0°C around 2044-2045 with additional El Niño excursion opportunities in the 24-year window. I partially accept the Devil's Advocate's critique on ensemble homogeneity (genuine contrarian views exist around HadCRUT running cooler and potential La Niña/volcanic forcing) and on double-counting ENSO in the 2024 anchor — these push slightly downward. However, I accept Challenge 1's point that resolution likely allows any major dataset's annual mean, which favors crossing (ERA5 already at ~1.6°C in 2024 means only ~0.4°C more needed in 24 years with a strong El Niño), pushing slightly upward. These largely offset, and the market at 76% with shallow liquidity and a downward drift sits within noise of my estimate, so I converge modestly to 74%.