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Since 1994, the researchers have found increasing amounts of evidence suggesting that lion bones are starting to replace tiger bones in certain tonics and cure-alls. Records show the industry forming in fits and starts-a skeleton here, a live lion there. The real action, though, began in 2007, after the international community adopted stricter measures to protect tigers and other big cats in Asia. The following year, South Africa issued permits for the export of 50 lion skeletons. By 2011, that number had jumped to 573 skeletons.

Thanks to a study published today in the journal Science, we finally have an estimate. Are you sitting down? Humans release between 5.3 million and 14 million tons of plastic into the ocean annually.