Cadmium contaminated rice

As some of you may have heard last month, Cadmium was found to have contaminated rice in China. There was an interesting article about it in the Bloomberg News: 

http://www.bloomberg.com/news/2013-06-13/china-to-survey-level-of-soil-pollution-nationwide-xinhua-says.html

Human pollution is believed to be the cause.  This has understandably caused public outrage and spurred a nationwide project to determine the level of 78 elements in top soil and deeper soil levels. Bloomberg also mentions that according to a Xinhua report, China's land ministry previously stated that testing had found abnormally high levels of cadmium, mercury, lead and arsenic in parts of the mid-and lower-tributaries of the Yangtze River.