There was a theory, although it may have now been debunked, that the testing of nuclear weapons caused a nuclear winter to some extent, thus offsetting the obvi

There was a theory, although it may have now been debunked, that the testing of nuclear weapons caused a nuclear winter to some extent, thus offsetting the obvious effects of global warming for some time. So from the 1940s, to whenever it was finally phased out (1980s) , nuclear weapons tests somewhat blocked the possibility of heatwaves being so extreme. This could partly explain the absence of such extremes between 1930s and now. Or it could entirely be a coincidence and randomness. What worries me is simply the extent to which this year's heatwave beats previous records. It does seem to point to an accelerating scenario. Established climate scientists are now saying they may have underestimated how bad its going to be. Previous worst case scenarios for warming were scary enough. I'm concerned about a vicious circle scenario, a positive feedback loop. We really don't want to go there.