While your figures are likely correct for direct damage, it would most certainly destroy human civilization for several generations at minimum. Which is genera

While your figures are likely correct for direct damage, it would most certainly destroy human civilization for several generations at minimum. Which is generally what is meant by "destroy the world", not that the planet would be literally destroy but rather human life as we know it would cease to exist. Even if you survive the blast, and radiation, even if you are not impacted by the environmental disaster, every world government, every world economy, every thing about modern human life would collapse in fall of nuclear war. We have problems now because our trinkets from china are being delayed a few weeks off the shore... What happens when the supply chain is not simply slow, but instead is gone?