Nuclear weapons obliterate targets. The soot ejected into the stratosphere spreads, changing global weather patterns. When weapons are especially high yielding, the resultant soot could trigger global famine.

中文翻译：

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即使是一场小规模的核战争也会威胁到粮食安全

核武器摧毁目标。喷入平流层的烟尘扩散开来，改变了全球天气模式。当武器产量特别高时，产生的烟灰可能引发全球饥荒。