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Iconic African elephant population on the brink
The elephant poaching wars are on the doorstep of Botswana, once thought to be a refuge for wild elephants. CNN's David McKenzie meets Mike Chase, a researcher trying to save the elephants by watching from the skies.
05:49
- Source:
CNN
We're entering into Earth's 6th mass extinction
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Listening for extinction: the amphibian apocalypse