Quote Originally Posted by swirly_the_toilet_fish
We had only two, and the scientists actually believed the bombs would set the atmosphere on fire and destroy the entire planet.
I saw a drama documentary about the Manhatten Project years ago on the BBC (maybe around the 50th anniversary) and that had a scene where Oppenheimer told their military liaison officer that one of the scientists had raised this fear, but when the others did the calculations it turned out to be a miniscule probability. (If I remember right it was 3 in several million.)