Temperatures would plunge in a bigger shift than the last Ice Age and crops would fail around the world after nuclear war erupted, a study has shown. The after-effects would be long-lasting with oceans taking hundreds of years to recover, and fishing devastated, the researchers warn. Professor Cheryl Harrison, of Louisiana State University, said: "It doesn't matter who is bombing whom. It can be India and Pakistan or NATO and Russia. Once the smoke is released into the upper atmosphere, it spreads globally and affects everyone." In all the simulated scenarios, nuclear firestorms would release soot and smoke into the...