During the 50's and 60's many nuclear bombs were tested in the atmosphere. I don't know the exact total megatonnage but I do know that the largest test, the "T

During the 50's and 60's many nuclear bombs were tested in the atmosphere. I don't know the exact total megatonnage but I do know that the largest test, the "Tsar Bomba" alone was 50 MT. So the total megatonnage of all atmospheric nuclear tests very likely exceeds 137 MT by quite a good margin, and, whether for better or worse, the world is still here.