broosAdmin The first atom bombs were droped on the Japanese cities of Nagasaki and Hiroshima, brining the second world war to an end. nuclear reactors for electricity generation were subsequently developed and now account for about 10% 6 all electricity generation worldwide. Concerns about radioactive waste and the chernobyl disaster caused nuclear power to full out of favour, but the current generation of nuclear power stations will need to be replaced if fossil fuel usage is cut back to combat global warming and electricity cuts and fuel rationing are to be avoided.