The climate effects of nuclear war

Area of Science:

• Environmental Science
• Global Security
• Climate Science

Background:

• Nuclear weapons represent an existential threat due to their unique destructive capabilities.
• The primary toll of nuclear war results from fires, leading to agricultural collapse and global famine.
• Decades-long global cooling, darkening, and drying are projected consequences of widespread nuclear conflict.

Purpose of the Study:

• To review the history and current status of research on the climatic and food production impacts of nuclear war.
• To draw lessons from past research and highlight new initiatives by the UN and WHO.
• To underscore the consequential scientific evidence regarding nuclear winter and famine.

Main Methods:

• Review of historical and current scientific research on nuclear war effects.
• Analysis of climate modeling data concerning soot injection and its atmospheric impact.
• Examination of agricultural production models under simulated nuclear winter conditions.

Main Results:

• Even limited nuclear war (2% of arsenal) could induce ice age temperatures, endangering over 2 billion people with starvation within two years.
• Large-scale nuclear war risks human extinction, mass species extinction, and catastrophic disruption of Earth systems.
• The evidence for nuclear winter and subsequent famine is the most significant scientific finding of the nuclear age.

Conclusions:

• Nuclear war poses an unparalleled existential threat to humanity and the biosphere.
• The long-term consequences, including nuclear winter and famine, are scientifically well-established and dire.
• International initiatives by the UN and WHO are crucial for addressing the effects and prevention of nuclear war.