The nonprofit International Water Management Institute (IWMI) concluded in 2004 that pollution of accumulated cadmium had changed the color of the rice in the area. Upon the discovery, the Thai government banned farmers in the polluted area from cultivating rice. So, Yen began growing corn for fuel use and other vegetables in place of rice, but in vain. “They didn’t grow well, so I couldn’t make enough money,” she said.
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Source: http://www.yomiuri.co.jp/dy/world/20090215TDY04306