Nuclear winter, would it happen?

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Models indicate that ash and fumes from urban fires resulting from nuclear war could lead to a nuclear winter, significantly impacting global climate and agriculture. Recent discussions focus on the validity of these models, particularly in light of advancements since the original studies from the 1980s. Research by Robock et al. in 2007 and Mills et al. in 2008 has refined the understanding of nuclear winter scenarios, suggesting that even a limited nuclear conflict could trigger prolonged climatic changes. These updated models emphasize the potential for severe environmental consequences, reinforcing concerns about the implications of nuclear warfare on a global scale.
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Models suggest that the ash and fumes caused by cities set on fire by nuclear war would cause a nuclear winter.

Are these models still valid, or do more refined models suggest that such a scenario would not occour, or that even a limited nuclear war would cause an extended nuclear winter?

What is the update on the model of nuclear winter out of the 80s?
 
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