Climate-induced environmental factors cause human extinction before 2100.

Question

Six frontier AI models put this at 1% by 20 Sept 2076. Full reasoning from every model.

WillHappen.ai · Accepted Answer

1% — the median of 6 frontier models, resolving by 2076-09-20.

Answer

Gemini (Google): 1% — Complete human extinction by 2076 requires eliminating every isolated, wealthy, or high-latitude population via climate effects alone. Even under extreme warming (>5°C by 2100), substantial land area at high latitudes remains agriculturally and physiologically viable. Billionaires, governments, and sub-polar refuges possess ample energy, indoor farming, and technology to preserve small populations. A massive runaway greenhouse effect that vaporizes oceans is physically impossible under Earth's carbon inventory and solar constant.

Answer

Claude (Anthropic): 1% — No credible climate science pathway leads to full human extinction by 2076, let alone complete attribution. Even worst-case IPCC scenarios (RCP8.5, >4°C by 2100) project severe harm, mass displacement, and regional collapse, not species extinction. Humans survive in extreme climates (deserts, arctic, high altitude) already, making total extinction via gradual climate shifts implausible within 50 years. Resolution requires both extinction and direct causal attribution to climate alone, an extremely high bar that excludes nuclear war, pandemics, or AI risk compounding.

Answer

GPT (OpenAI): 1% — It requires every human population to die from climate disruption within 50 years, a far more extreme outcome than collapse scenarios. The IPCC assesses severe, escalating harms, but does not project human extinction under its high-emissions scenarios this century. Extinction would require simultaneous failure of dispersed refuges, food systems, adaptation, and reproduction before 2076. I would raise this sharply only if observed warming or Earth-system feedbacks exceeded high-end projections and made large regions uninhabitable.

Answer

Grok (xAI): 1% — Runaway climate feedbacks would have to make Earth unsurvivable for every human by 2076. IPCC AR6 high-end SSP5-8.5 still yields ~4–5 °C by 2100, well below global wet-bulb extinction thresholds. Pleistocene glacial–interglacial swings of similar magnitude never extinguished Homo sapiens. Only an unmodeled Venus-style runaway (ruled out on Earth timescales) would shift the odds.

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DeepSeek (DeepSeek): 0% — No plausible climate pathway kills every human on Earth; extinction requires a mechanism that doesn't exist. Even 4°C warming leaves habitable refugia (Siberia, Patagonia, Antarctica coast) and millions of humans; extinction needs 100% mortality, not civilizational collapse. IPCC AR6 WGII finds no evidence of climate-driven human extinction; worst-case scenarios project billions displaced, not zero survivors, by 2100. The only tail risk is a poorly-understood feedback (e.g., runaway methane or ocean anoxia) that eliminates all refugia — no such mechanism is documented in the…

Answer

Qwen (Alibaba): 0% — Total human extinction from climate within 50 years requires a mechanism no credible model produces even under worst-case scenarios. No peer-reviewed climate model projects conditions incompatible with all human survival; even RCP8.5 leaves habitable zones in high latitudes. Humans occupy every continent and possess technology (nuclear, geothermal, sealed habitats) that decouples survival from surface climate. Base rate for species-level extinction of a globally distributed, technologically advanced species in a 50-year window is effectively zero.

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