An endangered Sumatran tiger wades through a streamTom Brakefield / Getty
From Time Magazine:
The planet is in the middle of an extinction crisis, the sixth great wave in its history. But unlike major extinction events of the past — like the Permian-Triassic event 250 million years ago, in which 70% of all terrestrial species were wiped out, probably because of an asteroid impact or a similar natural disaster — this time human beings are the cause. Hard numbers are difficult to find, but many scientists believe Earth's species are going extinct at a rate that is up to 1,000 times higher than before human beings came on the scene.
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