By Juliet Fuisz, CNN
Many of us believed that the ban on ivory, more than two decades ago, had ended the illegal ivory trade and saved Africa's elephants.
But instead, the magnificent creatures are again in danger of extinction because of a resurgent soaring demand for ivory half a world away in China.
Twenty-five thousand elephants were killed in 2011 – poaching levels that had not been seen in more than ten years.
The U.S. government describes a new sort of ivory organized crime that spurs on these massacres by heavily armed militias. In many parts of the African continent, murder rates now exceed population growth, meaning that the African elephant could simply disappear altogether.
In the video above Christiane Amanpour previews a National Geographic documentary called "Battle for the Elephants," in which reporter Bryan Christy investigated how Asia's booming ivory industry is keeping African poachers in business.