Your old computer could be a better source of metals than a mine

From your water-logged phone to your smashed smart TV, those personal electronics headed for the landfill are a potential goldmine. Economists already knew that along with the swelling 44.7 million metric tons of electronic waste tossed each year we were throwing out billions of dollars in resources. But quantifying all the gold, copper, iron, plastic, and rare earths languishing in our landfills and recycling centers is only part of the problem. Figuring out whether it's worthwhile, financially speaking, to sift those resources out of the rubble--instead of continuing to extract them from traditional mines--is another issue entirely. A study published in Environmental Science & Technology this week finally has an answer, suggesting that'urban mining' of electronic waste for copper and gold in China was actually more cost-effective than digging those metals out of the ground.