"Extinction is as old as life on Earth - about 3.5 billion years - but scientists calculate that we are losing species at a rate of somewhere between 1,000 and 10,000 times higher than the natural "background" rate of extinction. This means that technically we are going through a period of "mass extinction", the sixth that we know about over the hundreds of millions of years of the fossil record. But unlike the previous five mass extinctions, this one is largely caused by the actions of a single species - Homo sapiens."
(emphasis mine)
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