Solar-panel manufacturers produce a green energy source, but they also generate tons of toxic waste, which increases the product's carbon footprint and goes largely unreported, according to an Associated Press analysis. California requires plants to report the amount of hazardous waste produced, but only 17 of 41 solar manufacturers based there reported waste to the state Department of Toxic Substances Control, the analysis found. From 2007 to mid-2011, those companies' manufacturing operations resulted in 46.5 million pounds of contaminated water and sludge.

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