Weapons of Mass Destruction (WMD) in the twenty-first century

In 1945 two bombs in Hiroshima and Nagasaki shook the world as something whose explosive power was some 200,000 times a one thousand ton TNT bomb. The extent of damage has been extensively discussed. An exchange of a megaton-range strategic bomb could wipe out the earth and its civilization. It is possible that with the passage of time, the analysis of WMD war has become intellectually less real. It is time to carefully study a possible WMD world war in the 2030s.