sentences:  In 2013, it was revealed that portions of the country's rice supply were tainted with the toxic metal cadmium.A 2006 Chinese green gross domestic product estimate stated that pollution in 2004 cost 3.05% of the nation's economy.A 2007 World Bank and SEPA report estimated the cost of water and air pollution in 2003 to 2.68% or 5.78% of GDP depending on if using a Chinese or a Western method of calculation.