World Wildlife Populations Down 73% Since 1970, but Many Species Remain Uncounted

According to the World Wildlife Fund's 2026 Living Planet Index, worldwide wildlife numbers have shrunk dramatically, with an average decline of 73 % since 1970. Compiled every two years from data on thousands of vertebrate species, the index highlights a persistent downward trajectory that scientists warn endangers ecosystem stability and the benefits they deliver.

It relies on decades‑long monitoring of mammals, birds, fish, reptiles and amphibians, juxtaposing counts from the early 1970s with the latest surveys. Although the 73 % statistic indicates a widespread drop among the sampled species, it does not mean that three‑quarters of all Earth’s animals have vanished; instead, it represents the mean decrease within the tracked cohorts.

Researchers point to a range of anthropogenic stressors as the cause: conversion of habitats for farming and cities, overharvesting of wildlife, pollution, and the escalating effects of climate change. Across numerous areas, the cumulative impact of these forces has driven species to near‑extinction, eroding genetic diversity and unsettling food chains.

Nevertheless, the Living Planet Index draws attention to a major data shortfall. A substantial share of global fauna—particularly invertebrates, deep‑sea life and numerous tropical species—are poorly represented in existing monitoring schemes. In the absence of full inventories, the actual magnitude of biodiversity decline could exceed the index’s indication, spurring demands for broader citizen‑science projects and greater funding for biodiversity surveys.

These results emerge at a pivotal juncture, as governments and NGOs haggle over post‑2020 biodiversity goals. Decision‑makers are called upon to turn the index’s alarm into tangible measures: bolstering protected‑area networks, halting illegal wildlife trafficking, and weaving nature‑based solutions into climate policies. Ongoing improvement of the Living Planet Index, expanding its taxonomic reach, will be crucial for monitoring advances and ensuring accountability among stakeholders.