Detailed text transcripts for TV channel - CNN - 20170716:10:49:00
Scientists say it is clear earth is entering its sixth mass extinction event. >> it means three-quarters of all species could disappear in the coming centuries. >> all around the world, from the savannahs of africa to remote islands in the pacific there is a mass extinction brewing. >> start counting. >> reporter: spe expertise are vanishing ruffle 100 times the normal rate. if current trend continue, africa he will banelephants co h extinct in as few as 20 years. in all, biologists here the unthinkable. three-quarters of all known species could disappear in a couple of centuries. we have neve...
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