Nuklear exposions affect not only this planet but our Galaxy and entire Universe. So yes those guys who shut down nukes in 1964 can do it again, not only for us but for themselves as well.
I had the same feelings listening to George Green. He has some informations but not to be trusted fully. He doesn't resonate positively, just spread the FEAR.
Since we've learned that our future depends from global consciousness I am very carefull with the statesments like George Green presented about Nothern Hemisphere