Cascading Climate Collapse

The most probable pathway to global collapse is a cascading failure of Earth's ecological and climate systems, compounded by geopolitical fragmentation. Unlike sudden existential threats like nuclear war or AI misalignment, climate collapse is already in motion, driven by compounding environmental feedback loops. As critical tipping points are breached—such as the thawing of permafrost, the dieback of the Amazon rainforest, and the collapse of major ice sheets—runaway warming will accelerate beyond human mitigation capabilities.

This environmental degradation acts as a threat multiplier, dismantling the foundations of modern society. Severe disruptions to global agriculture and fresh water supplies will trigger unprecedented mass migration and resource scarcity. Geopolitically, this will fracture international cooperation, leading to resource wars, the rise of authoritarian eco-nationalism, and the breakdown of global supply chains.

Technological interventions, such as geoengineering or advanced carbon capture, will likely fail to scale in time due to economic constraints and a lack of unified global governance. Ultimately, the compounding stress of uninhabitable equatorial regions, collapsing ecosystems, and continuous societal conflict will erode the carrying capacity of the planet, leading to the irreversible end of complex human civilization.