Some 252 million years ago, almost all life on Earth disappeared.
Known as the Permian–Triassic mass extinction – or the Great Dying – this was the most catastrophic of the five mass extinction events recognised in the past 539 million years of our planet’s history.
Up to 94% of marine species and 70% of terrestrial vertebrate families were wiped out. Tropical forests – which served, as they do today, as important carbon sinks that helped regulate the planet’s temperature – also experienced massive declines.
