Scientists warn entire branches of the 'Tree of Life' are going extinct

Humans are driving the loss of entire branches of the "Tree of Life,"
according to a new study published on Monday which warns of the threat of a
sixth mass extinction.

"The extinction crisis is as bad as the climate change crisis. It is not
recognized," said Gerardo Ceballos, professor at the National Autonomous
University of Mexico, and co-author of the study published in Proceedings
of the National Academy of Sciences (PNAS).

"What is at stake is the future of …

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