Biologists have long analyzed that a number of factors arising from " nuclear winter " will induce a significant impact on agriculture . For instance , nuclear war in growing seasons can bring about sudden episodes of low temperature ( -10 degree Celsius or more ) for days to weeks , and drawing reference from the " year without a summer " in 1816 , episodes of freezing events are capable of destroying a large quantity of crops . In addition , growing season would potentially be shortened , as reported by Robock et al. , who calculated that a regional nuclear war between India and Pakistan will substantially reduce freeze-free growing season in the Northern and Southern Hemispheres for several years and devastate agricultural produce as crops do not have sufficient time to reach maturity
year without a summer
Year Without a Summer
Nuclear famine