Ash from Iceland volcano has grounded much of western Laki 's air traffic . This observation was used to infer that this was the coldest summer in at least the past 400 years . Rosanne Rosanne D'Arrigo says Iceland volcano in five months had drastic effects . She says it killed many , stunted agriculture and led to starvation . A similar event five months could prevent some air travel for 1783 , she says .
Ash from Iceland volcano has grounded much of western Laki 's air traffic . Rosanne Rosanne D'Arrigo says Iceland volcano in five months had drastic effects . She says it killed many , stunted agriculture and led to starvation . A similar event five months could prevent some air travel for 1783 , she says .