The sixth mass extinction—the only one attributable entirely to human activity—exhibits extinction rates far exceeding those of previous geological cataclysms in velocity, if not yet in total magnitude. The iconic “1 million species threatened” stems from the 2019 IPBES report, extrapolated from assessments showing high risk across ~8 million eukaryotic species. As of late 2025, debate persists: while documented extinctions remain low (~0.1-2% of species), elevated rates (100-1,000x background) and threats to ~20-50% of assessed groups signal an accelerating crisis surpassing past events in speed.
Speed vs. Past Events
Past mass extinctions (e.g., end-Permian ~96% marine loss over ~60,000 years) unfolded over millennia; today’s rates—driven by habitat loss, climate, invasives—compress comparable proportional threats into centuries. 2025 analyses (e.g., Wiens/Saban) note documented losses don’t yet hit 75% thresholds, often island-focused, but projections under unchecked drivers forecast rapid escalation.
The Brink and Beyond
Consensus: crisis severe, rates unmatched in speed; debate: whether full “mass” status yet (scale vs. velocity). Barren futures loom if unchecked.
Human-driven speed outpaces ancient cataclysms—1 million on brink signals tipping. Is this the fastest extinction yet, or can we brake before the abyss?