Mine: Nuclear winter (also known as atomic winter) is a hypothetical climatic effect of nuclear war that is theorized that detonating large numbers of nuclear weapons could have a profound and severe effect on the climate causing cold weather and reduced sunlight for a period of months or even years, especially nuclear weapon strikes on flammable targets such as cities, where large amounts of smoke and soot would be ejected into the Earth's stratosphere; a Similar climatic effects can be caused by comets or an asteroid impact, and also sometimes termed an impact winter, or by a supervolcano eruption, known as a volcanic winter; The nuclear winter scenario predicts that if enough huge city firestorms follow the nuclear explosions of a nuclear war, the firestorms could loft massive amounts of dense sooty smoke from the fire, into the upper troposphere / stratosphere, then, At 10-15 kilometers (6–9 miles) above the Earth's surface, the absorption of sunlight would further heat the smoke, lifting some, or all of it, into the stratosphere, where the smoke would persist for years, with no rain to wash it out so This aerosol of particles would block out much of the sun's light from reaching the surface, with this causing surface tem peratures to drop drastically, and with that, it is predicted surface air temperatures would be akin to, or colder than the regions winter, for years on end; The exact timescale for how long this smoke remains, and thus how severely this smoke affects the climate once it reaches the stratosphere, is dependent on both chemical and physical removal processes, while The physical removal mechanisms affecting the timescale of smoke particle removal are how quickly the particles in the smoke coagulate and fall out of the atmosphere via dry deposition, and to a slower degree, the time it takes for solar radiation pressure to move the particles to a lower level in the atmosphere; Whether by coagulation or radiation pressure, once the particles are at this lower atmospheric level cloud seeding can begin, permitting precipitation to wash the smoke aerosol out of the atmosphere by the wet deposition mechanismand The chemical processes that affect the removal are dependent on the ability of atmospheric chemistry to oxidize the smoke, via reactions with oxidative species such as ozone and nitrogen oxides, both of which are found at all levels of the atmosphere and Historical data on residence times of aerosols, albeit a different mixture of aerosols, from megavolcano eruptions appear to be in the 1-2 year time scale but Aerosol atmosphere interactions are still poorly understood.
(Edit): I win?
Classicgen forever.