Our planet is heating up.  How hot?  Says   Ukraine President Volodymyr Zelenskyy , if talks with Russia fail, it could lead to World War 3.  So, with 100 Hiroshima-size bombs, the   atmospheric temperature would fall around 2F.   Huh?  Yup, carbon particles will be tossed into the upper troposphere to reduce sunlight, and our weather will cool. 100 Little Boys ( fell on Hiroshima ) actually are almost nothing today.  That one 1961  Tsar Hydrogen Bomba  thermonuclear explosion of the Soviet Union imparted the energy of 1570 times those Hiroshima and Nagasaki atomic bombs combined.  Keep in mind, though, that this was only 25% the yield of the 1883 Indonesia Krakatoa eruption.  So nature can be worse. Scarily enough, nine countries have  13,400 nuclear weapons,  all more powerful than Little Boy.  1800 of those weapons are held in high alert.  That was old news, for the latest this year is that number is now  12,700, 90% owned by the U.S. and Russia.   The U.S., China and Russia are act