Nuclear Winter: Geographic Distribution and Weapon Quantity
Nuclear winter requires geographically distributed detonations across urban areas — concentrated blasts give diminishing returns. Firestorm-driven soot must reach the stratosphere to cause sustained cooling.
The geographic distribution of nuclear detonations matters more than raw weapon count for triggering nuclear winter. Concentrated detonations in one area give diminishing returns for soot lofting. To generate sufficient stratospheric soot for a nuclear winter scenario, detonations must be geographically spread across multiple urban and industrial areas. The soot from burning cities — not the nuclear explosions themselves — is the primary driver of the cooling effect. The soot must reach the stratosphere (above ~10 km altitude) where it persists for years, blocking sunlight. Ground-level fires may not loft soot high enough; firestorms that create their own convection columns are needed to push particles to stratospheric heights.