Will humans survive the sixth great extinction?

Naitonal Geographic: In the last half-billion years, life on Earth has been nearly wiped out five times-by such things as climate change, an intense ice age, volcanoes, and that space rock that smashed into the Gulf of Mexico 65 million years ago, obliterating the dinosaurs and a bunch of other species. These events are known as the Big Five mass extinctions, and all signs suggest we are now on the precipice of a sixth. Except this time, we have no one but ourselves to blame. According to a study published last week......

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