So why has human life expectancy gone up since the 1970's, and childhood mortality gone down?
The rule: lose and gain: longevity thanks to low exposition of radiation and to genetic manipulation of food... on the other hand increasing autism.
The number of children diagnosed with autism or related disorders has grown at what many call an alarming rate. In the 1970s and 1980s, about one out of every 2,000 children had autism.
Even when opinions are controversial due to the different interpretations of data, disorders like autism, body flexibility (new generations with greatly capability of contortionism ) , and other conditions are becoming more common.
Also review the records showing that low level of radiation caused survivors of Hiroshima and Nagasaki to a greater longevity than Japanese not exposed at all or greatly exposed to it.
Nuclear explosions in open atmosphere messed up our planet and the living world. When the damage was found out, it was a consensus to stop immediately this kind of tests and do nuclear tests solely underground. Even China and Russia had no other choice but to agree.