Scotsman: MANY of the world’s poorest regions could face severe crop shortages, famine and hunger in the next two decades because of global warming, researchers warned yesterday. Scientists used 20 computer simulations to determine how changing temperature and rainfall were likely to affect crop yields. They concluded that, by 2030, the average temperature in most of the regions where a large proportion of the world’s underfed populations live could rise by 1C. At the same time, seasonal …