BBC: In Japan government scientists are trying to find ways to reduce the impact of global warming on the country’s rice crop. There are fears that the extremes of temperature that some researchers are predicting could affect both the yield and the quality of rice, a staple of the Japanese diet. Flowering grain crops like maize, wheat and rice are particularly vulnerable to changes in temperature. Rice is believed to have been cultivated in Japan for more than 2,500 years. …