The ongoing sixth mass extinction—the first driven primarily by a single species—continues to accelerate, with human activities pushing biodiversity toward collapse. The landmark 2019 IPBES Global Assessment warned that around 1 million species are threatened with extinction, many within decades—a figure extrapolated from assessments of ~172,000 species (with ~28-50,000 threatened) and still widely cited in 2025 reports. While documented extinctions remain in the hundreds to thousands since 1500, the “extinction debt” (committed losses from current threats) suggests hundreds of thousands to a million could vanish by mid-century under high-impact scenarios.
2025 Snapshot and Projections
IUCN Red List (updated 2025) assesses ~172,000 species, with ~50,000 threatened. Vertebrate populations down ~70% since 1970; amphibians/insects hit hardest. Models (e.g., 2022-2025 studies) project 6-27% local vertebrate loss by 2050-2100, amplified by co-extinctions (up to 184% worse). High-emission paths risk 30-50% species commitment to extinction by 2050 in hotspots.
Ecosystem Unraveling
Cascades threaten services: pollination failure → food insecurity; predator loss → imbalances. Tipping points (e.g., reef/forest collapse) compound risks.
Debate persists—some 2025 papers argue rates don’t yet match past “mass” events—but consensus affirms unprecedented acceleration and human causation.
The sixth extinction unfolds now, with millions potentially lost by 2050. Can transformative action halt it, or will silence prevail?