A new study finds that close to 9,000 square kilometers of Amazon forest was cleared from 2008 to 2012 without detection by the official government monitoring system. That's an area roughly the size of Puerto Rico.

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A new study finds that close to 9,000 square kilometers of Amazon forest was cleared from 2008 to 2012 without detection by the official government monitoring system. That's an area roughly the size of Puerto Rico.