Climate Catastrophe

Based on accelerating global trends, the most likely world-ending scenario is a cascading climate catastrophe driven by unchecked environmental degradation. Rising temperatures, fueled by greenhouse gas emissions, are already causing widespread extreme weather events, sea-level rise, and biodiversity loss. By mid-century, these could trigger tipping points like the collapse of major ice sheets and ocean currents, leading to mass displacement, food shortages, and societal breakdown.

Geopolitically, resource wars over water and arable land would escalate, while technological efforts like geoengineering might backfire, exacerbating instability. Socially, inequality amplifies vulnerability in developing regions, hastening global collapse. Without drastic mitigation, this slow-burn apocalypse could render the planet uninhabitable for human civilization within decades, outpacing other risks like nuclear conflict or pandemics in probability due to its inevitability under current trajectories.