Biodiversity Collapse and Ecosystem Service Failure
Human activity is driving species extinction at 100 to 1000 times the background rate, with approximately one million species threatened. The WEF ranks biodiversity loss and ecosystem collapse as the number two global risk over the 10-year horizon, up from number 37 in 2009. Unlike single-species loss, ecosystem service failure cascades through pollination, soil health, water purification, and climate regulation, threatening agricultural productivity and human health systems that depend on functioning ecosystems. Whether current rates constitute a sixth mass extinction is debated, but the functional consequences for civilization are severe regardless of the label.
Probability
Horizon: 30y
By consensus
Claims
Approximately one million animal and plant species are threatened with extinction, including 40 percent of amphibians, one-third of reef- building corals, more than one-third of marine mammals, and 10 percent of insects.
IPBES 2019 Global Assessment, endorsed by 132 member governments, produced this estimate from a synthesis of approximately 15000 scientific sources. A second Global Assessment is underway with first author meetings in November 2025.
Indigenous communities managing roughly 80 percent of remaining biodiversity report accelerating species loss consistent with and often preceding IPBES findings. Traditional ecological knowledge provides longitudinal observations that complement formal monitoring.
Current extinction rates may not technically constitute a mass extinction by the geological definition of 75 percent species loss, but projections of 12 to 40 percent species loss are sufficient to cause ecosystem service failures with catastrophic consequences for human civilization.
The 2025 Trends in Ecology and Evolution study argues that 12-40 percent loss projections fall short of the 75 percent mass extinction threshold, but this does not diminish the functional severity. Ecosystem service failure can cascade at much lower thresholds of biodiversity loss.
Ecosystem services exhibit nonlinear responses to biodiversity loss. Keystone species removal or functional group collapse can trigger ecosystem regime shifts at loss levels far below 75 percent. The mass extinction label is irrelevant to the risk assessment; functional collapse is the operative concern.
Emerging technologies including gene drives, de-extinction, precision conservation, and AI-powered monitoring could stabilize and partially reverse biodiversity loss if deployed at scale. The trajectory is concerning but not irreversible given sufficient investment and political will.
Indicators
- • Vertebrate population decline exceeding 68 percent since 1970 (WWF Living Planet Index)
- • Insect biomass declining in monitored regions, threatening pollination services
- • Coral reef bleaching events becoming annual rather than decadal in tropical oceans
- • Amphibian extinction rates exceeding background by orders of magnitude (40 percent threatened)
- • Soil biodiversity loss reducing agricultural productivity in intensive farming regions
- • Failure to meet Kunming-Montreal Global Biodiversity Framework targets by 2030 milestones
Interactions
Sources
- IPBES Global Assessment Report on Biodiversity and Ecosystem Services (2019) (accessed Fri Apr 03 2026 00:00:00 GMT+0000 (Coordinated Universal Time))
- WEF Global Risks Report 2025 — Biodiversity Loss Ranked Number 2 at 10-Year Horizon (accessed Fri Apr 03 2026 00:00:00 GMT+0000 (Coordinated Universal Time))
- WWF — The Sixth Mass Extinction Explainer (accessed Fri Apr 03 2026 00:00:00 GMT+0000 (Coordinated Universal Time))
- PLOS Biology — Questioning the Sixth Mass Extinction (Trends in Ecology and Evolution, 2025) (accessed Fri Apr 03 2026 00:00:00 GMT+0000 (Coordinated Universal Time))
- LSE — Facing the Global Biodiversity Crises and Sixth Mass Extinction (accessed Fri Apr 03 2026 00:00:00 GMT+0000 (Coordinated Universal Time))