Citing evidence that species are becoming extinct at a thousand times faster than the background rate, many argue the Sixth Great Mass Extinction is already upon us. And for the first time caused by a single species, humankind. Others contend that at current rates - 100 species a year - it would take a 1000 years to lose just 1% of current species. In the meantime the number of new species is continuing to grow - exceeding the number of species lost.

Are we facing a profound crisis? Do we need to radically change our behaviour and way of life to save the planet's animal life? Or are our conservation efforts proving effective and nature stronger than we suppose and capable of creating entirely new life forms without our help?

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