I wonder how many nuclear bombs it would take to raise global temperature by an average of 1.2C? I'm sure a physicist could tell you, but I bet the number would

I wonder how many nuclear bombs it would take to raise global temperature by an average of 1.2C? I'm sure a physicist could tell you, but I bet the number would be best expressed in exponential notation at least. And if we were setting off that many bombs every day, I bet people would be a bit concerned.