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Will Steffen Warns of Tipping Points Driving Collapse

8/17/2026

Summary

Story summary

Will Steffen, emeritus professor at Australian National University, warned that humanity is already on a collapse trajectory.
He identified tipping points such as Amazon rainforest collapse, complete polar ice-sheet melt and accelerating temperature rise.
Steffen said melting ice will raise sea levels, shrinking habitable land as populations grow.
He warned that permafrost covering 18 million km² stores up to 1.5 trillion metric tons of carbon that could be released.

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Story summary

Will Steffen, emeritus professor at Australian National University, warned that humanity is already on a collapse trajectory.
He identified tipping points such as Amazon rainforest collapse, complete polar ice-sheet melt and accelerating temperature rise.
Steffen said melting ice will raise sea levels, shrinking habitable land as populations grow.
He warned that permafrost covering 18 million km² stores up to 1.5 trillion metric tons of carbon that could be released.