Conservationist Beverly Joubert's Near-Death Experience

In a time of crisis, one of the most overlooked issues is the critical global collapse in biodiversity. Today 64 world leaders, preparing for a United Nations summit on the issue this week, pledged to reverse the decline by 2030. But is it a case of too little, too late? To answer that question, Christiane speaks with National Geographic Explorers Dereck and Beverly Joubert.