The tin and coltan that come from the Congo are mixed with those from Brazil, Russia, and China before they make it into our cell phones and laptops. There is a burgeoning consensus in international law that we should care about the conditions under which the products we consume—sweatpants, sneakers, and even timber—are produced. If we can hold companies accountable for their business practices, we will give an incentive to the Congolese government to clean up the mining sector. The “conflict minerals” legislation signed into law by President Obama in July 2010 is a step, albeit a small one,
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