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I need to update this thread. My position has changed since reading some more about it.
Recent studies of smoke in the 2019 Australian 'mega-fires' have shown that black carbon in smoke can be heated by sunlight and lifted even higher up. In a full scale nuclear war, the firestorms might lift all that soot up 15 to 20 km. The sun keeps it there - like a hot air balloon with enough fuel to keep the balloon aloft for years. It might float around up there for a decade!
While hundreds of millions might die in the nuclear war itself, shutting down all agriculture across the Northern Hemisphere might starve up to 5 BILLION.
They estimate only 1% of many northern nations would survive.
Study by Xia et al - 2022. Global food insecurity and famine from reduced crop, marine fishery and livestock production due to climate disruption from nuclear war soot injection - Nature Food
Recent studies of smoke in the 2019 Australian 'mega-fires' have shown that black carbon in smoke can be heated by sunlight and lifted even higher up. In a full scale nuclear war, the firestorms might lift all that soot up 15 to 20 km. The sun keeps it there - like a hot air balloon with enough fuel to keep the balloon aloft for years. It might float around up there for a decade!
While hundreds of millions might die in the nuclear war itself, shutting down all agriculture across the Northern Hemisphere might starve up to 5 BILLION.
They estimate only 1% of many northern nations would survive.
Study by Xia et al - 2022. Global food insecurity and famine from reduced crop, marine fishery and livestock production due to climate disruption from nuclear war soot injection - Nature Food
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