What Earth Will Look Like in 250 Million Years — And Why Nobody Agrees

The Atlantic is a young ocean, and it may already have started to close. A subduction zone under the Strait of Gibraltar is creeping westward into it — measured, published, and happening now. Follow that thread far enough and you arrive at a single continent, an interior too hot for mammals, and four rival maps of what Earth will actually look like. Nobody agrees which one is right. 00:00 Fifty degrees, and nothing alive 00:36 Gibraltar today: a drain, not a gap 01:44 The 2024 finding: the trench is invading the Atlantic 02:44 Where the measurements stop 03:07 The Atlantic is younger than you think 04:06 A trench spreads the way a rip runs through fabric 04:41 The Mediterranean goes first 04:58 One landmass, one scar 05:14 Why size changes the weather 05:49 Volcanic CO₂, and a brighter Sun 06:44 Three causes, stacked 07:15 Thirty-five degrees wet-bulb 07:57 Sixteen percent, then eight 08:41 Pangaea Ultima — one of four 08:47 Novopangaea, the favourite 09:14 Amasia and Aurica 09:48 Same tectonics, opposite ending 10:15 "Completely unfalsifiable" 10:53 Why anyone bothers to calculate this 11:20 Where we are standing 12:04 Give it twenty million years SOURCES The Gibraltar subduction zone is invading the Atlantic; ~20 million years of slow phase, then acceleration Duarte et al. 2024, Geology 52(5):331–335 — https://doi.org/10.1130/G51654.1 Pangaea Ultima in ~250 million years; interior summers of 40–50 °C; the Sun ~2.5% brighter; the habitable fraction falling from 66% today to 16% and then 8% Farnsworth et al. 2023, Nature Geoscience — https://www.nature.com/articles/s4156... The conclusion is contested on the record — "completely unfalsifiable" (Robert Stern); a forecast about mammals is a forecast about animals that don't exist yet (Tori Herridge); under Amasia mammals probably keep the planet (Jessica Whiteside) Scientific American — https://www.scientificamerican.com/ar... Four competing configurations: Pangaea Ultima/Proxima, Novopangaea, Amasia, Aurica — described by the authors of the models themselves The Conversation — https://theconversation.com/what-plan... Land and ocean masks for Aurica and Amasia, used as the geographic reference for those two maps Way, Davies, Duarte & Green 2021, Geochemistry, Geophysics, Geosystems, Figure 1 — https://doi.org/10.1029/2021GC009983 Preprint under CC BY 4.0 — https://doi.org/10.1002/essoar.105073... Assembly scenarios for Amasia (the canonical orthoversion case) Huang, Li & Zhang 2022, National Science Review — https://doi.org/10.1093/nsr/nwac205 Figure via Wikimedia Commons, CC BY 4.0 Present-day coastlines, bathymetry and topography used as the geographic reference throughout NASA Earth Observatory, Blue Marble — public domain NOAA ETOPO Global Relief Model — public domain Every scene in this film is AI-generated — no camera recorded this world. Figures and data come from the published research listed above. The science is sourced; the visual detail is interpretation, not scientific illustration. The script, research and narration choices are original.