Are we headed to a Nuclear Winter Nightmare?

With the threats from Russian Prime Minister Putin, President Biden's warning of Armageddon, and President Zelensky asking for a pre-emptive strike I think its time to discuss the threat of Nuclear War.
"World War 3 breaks out and a nuclear nightmare becomes reality as thousands of hydrogen bombs destroy the world's greatest cities. A deadly fallout of ash and debris creates a Nuclear Winter."
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