核かくの冬ふゆ

noun

nuclear winter

Refers to the hypothetical severe global climatic cooling effect predicted to follow a nuclear war, due to smoke and soot blocking sunlight.

• 核かくの冬ふゆが来くると、地ち球きゅうの気き温おんは急きゅう激げきに下さがるだろう。

  If a nuclear winter comes, the Earth's temperature will drop sharply.