There have been five mass extinction events in
Earth’s history. In the worst, 250 million years ago, 96 per cent of
marine species and 70 per cent of land species died off. It took
millions of years
Nowadays, many scientists are predicting that we’re on pace for a sixth
mass extinction. The world’s species are already vanishing at an
unnaturally rapid rate. And humans are altering the Earth’s landscape in
far-reaching ways: we’ve hunted animals such as the great auk to
extinction; we’ve cleared away broad swaths of rainforest; we’ve
transported species from their natural habitats to new continents; we’ve
pumped billions of tons of carbon dioxide into the atmosphere and
oceans, transforming the climate..
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