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WI: Trinity test canceled for fear of igniting atmosphere
What if the Trinity nuclear test was canceled due to many of the scientists working on it's fear that the explosion would ignite the atmosphere and destroy all life on Earth?

For clarification, there is nothing different about nuclear weapons in this scenario. The test would have gone as OTL. Any further tests, detonations, etc. will go as they would IRL.

What happens? Are nuclear weapons never invented? Are they invented years or decades later? By who? Does the cold war go hot without the threat of MAD? Or is all this speculation rendered irrelevant when someone higher-up overrides them and the test goes off an hour later?
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