Colombia& rsquo;s& nbsp;Serran& iacute;a& nbsp;de& nbsp;Chiribiquete& nbsp;was officially expanded& nbsp;to 4.3 million hectares today, making& nbsp;it& nbsp;the& nbsp;world& rsquo;s largest& nbsp;protected& nbsp;tropical rainforest& nbsp;national park. It was also& nbsp;declared as& nbsp;a UNESCO World Heritage& nbsp;site
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