Nuclear Winter

The second-order aftermath of nuclear war. Long-term food and warmth, weighed honestly and rarely.

ScopeExistentialCauseVariousDriven bySystemicImpactCatastrophicLikelihoodRare

Why it matters

What Nuclear Winter would mean for you

Three numbers decide how important Nuclear Winter is to your preparedness planning. Impact and Likelihood are general baselines. Vulnerability depends on how prepared you are for this threat.

ImpactCatastrophic9/9

NegligibleCatastrophic

The multi-year aftermath of nuclear war - a collapse of food and warmth worldwide - is a catastrophic Impact, the second-order tail of the nuclear threat.

LikelihoodRare1/9

RareFrequent

Contingent on a large-scale nuclear exchange that is itself unlikely, so the Likelihood is at the bottom.

VulnerabilityNot rated

NegligibleCatastrophic

This number is yours. It measures how hard Nuclear Winter would actually hit your household given what you already have in place. Rate it in Threat Planning — then all three multiply into your personal threat rating.

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General baselines — How we rate threats →

Be ready

Preparing for Nuclear Winter

Concrete moves that lower your Vulnerability. Add any of them and we'll track it as an action on your threat list.

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Build the deepest practical food and heat reserves.

Keep means to grow and preserve food without sun-dependence.

Build durable skills and community.

Treat it as the tail of nuclear war, planned for soberly.

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Articles on Nuclear Winter

Primer

Threat Analysis·8 min read

Nuclear winter is a food problem measured in years — which is why you build for it last

It's not a blast or fallout. It's a cold, dark, food-scarce world lasting years, and the only real hedge is the deepest version of the food, heat, and community you're already building.

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Act on it