Five mass extinctions have happened in Earth's history, and numerous experts have warned that a sixth mass extinction could already be underway as a result of human activity since the Age of Exploration. Some scientists have even suggested that nearly 40% of the species(opens in new tab) currently residing on our planet could be extinct as early as 2050.
But is this just a worst-case scenario? Is such a dramatic decline in Earth's species likely to happen?
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