68% Global Decline in Wildlife Populations Signals Climate Emergency

A 68% average decline in global wildlife populations, documented by the IPBES Global Assessment, highlights a climate emergency that threatens ecosystem services, human well‑being, and the stability of the planet.

What Is 68% Global Decline in Wildlife Populations Signals Climate Emergency?

The phrase refers to the average reduction in abundance of monitored vertebrate species—mammals, birds, reptiles, amphibians, and fish—across the planet’s terrestrial and freshwater ecosystems. The metric is derived from long‑term population surveys compiled by the IPBES, which compare counts from the early 1970s to recent monitoring (generally 2015‑2020). It differs from extinction rates because it captures declines in living populations that are still extant, indicating ecosystem stress before species disappear entirely.

How Does It Work?

1. Habitat Loss and Fragmentation

Deforestation for agriculture, urban expansion, and infrastructure removes the physical space species need for feeding, breeding, and shelter. Fragmented habitats isolate populations, reducing genetic diversity and increasing extinction risk.

2. Climate Change

Rising average temperatures, altered precipitation patterns, and more frequent extreme events shift the climatic envelopes that species occupy. Species that cannot migrate quickly enough experience population drops, as documented for alpine plants and Arctic mammals.

3. Pollution

Persistent chemicals (e.g., pesticides), plastic debris, and nutrient runoff degrade water quality and soil health. Marine organisms ingest microplastics, while terrestrial insects suffer from pesticide exposure, both leading to mortality spikes.

4. Overexploitation

Unsustainable hunting, poaching, and fishing remove individuals faster than populations can replace them. The illegal ivory trade and overfishing of tuna are well‑studied examples that depress population numbers.

What Does the Evidence Show?

Multiple lines of evidence converge on the 68% figure. The IPBES Global Assessment (2020) synthesised 5,500 population time‑series from 2,800 species, revealing a median decline of 68% between 1970 and 2019. Independent monitoring programmes, such as the Living Planet Index (World Wildlife Fund, 2022) and the U.S. Geological Survey’s bird surveys, report comparable trends. Experimental studies confirm that temperature increases of 2 °C can reduce reproductive success in amphibians, while field experiments show that removing forest cover leads to rapid bird population crashes. Together, these observations provide moderate‑to‑strong evidence of a pervasive, human‑driven biodiversity loss.

Main Causes or Drivers

Direct Human Causes

• Land‑use change (agriculture, logging, urbanization)
• Greenhouse‑gas emissions driving climate change
• Chemical pollution and plastic waste
• Unsustainable harvest of wildlife

Underlying Socio‑Economic Drivers

• Global demand for commodities such as soy, palm oil, and beef
• Population growth and poverty that increase resource extraction
• Policy gaps and weak enforcement of environmental regulations

Environmental and Human Impacts

Environmental Impacts

• Reduced pollination services threaten crop yields, especially for fruits, nuts, and vegetables.
• Loss of predator species can cause pest outbreaks, affecting forest health.
• Degraded coral reefs diminish marine biodiversity and coastal protection.
• Altered nutrient cycling leads to soil degradation and increased erosion.

Human Health and Social Impacts

• Declines in insect populations reduce natural pest control, potentially raising pesticide use and associated health risks.
• Reduced fish stocks affect nutrition and livelihoods for coastal communities, especially in low‑income regions.
• Loss of culturally important species undermines indigenous knowledge systems and spiritual values.

Regional Differences

Temperate regions such as Europe and North America show slower declines in some bird groups due to extensive protected‑area networks, yet still experience significant losses in amphibians. Tropical regions, especially the Amazon basin, Southeast Asia, and Central Africa, face the steepest habitat‑loss rates, leading to higher average population reductions (often >80%). Arctic ecosystems are experiencing rapid climate‑driven changes, with polar bear and caribou populations showing marked declines. Island ecosystems, like those of the Pacific, suffer disproportionate losses because of limited range and high exposure to invasive species.

Solutions and Limitations

Effective responses fall into three broad categories:

• Prevention: Strengthening land‑use planning, enforcing anti‑poaching laws, and reducing greenhouse‑gas emissions. Limitations include political resistance and economic trade‑offs.
• Mitigation: Expanding and connecting protected areas, promoting agro‑ecological practices, and restoring degraded habitats. Restoration can be costly, and success depends on local ecological conditions.
• Adaptation: Facilitating species migrations through ecological corridors, and supporting communities that rely on biodiversity. Adaptive measures may be constrained by geographic barriers and funding.

What Individuals, Communities, and Governments Can Do

What Individuals Can Do

• Choose certified sustainable seafood and reduce meat consumption to lower pressure on marine and terrestrial habitats.
• Support organizations that protect habitats through donations or volunteer work.
• Advocate for stronger environmental policies by contacting elected representatives.

What Communities and Organizations Can Do

• Implement community‑based monitoring programs to fill data gaps and inform local management.
• Develop land‑use plans that integrate conservation corridors and protect critical habitats.
• Promote education programs that link cultural heritage to biodiversity stewardship.

What Governments Can Do

• Enact and enforce legislation that limits deforestation, restricts harmful chemicals, and sets science‑based hunting quotas.
• Scale up financing for protected‑area networks to meet the Aichi Target of 17% terrestrial and 10% marine coverage.
• Integrate biodiversity considerations into climate‑policy frameworks, such as Nationally Determined Contributions under the Paris Agreement.

Synthesis

The 68% global wildlife decline is a clear, evidence‑based indicator of a climate emergency that threatens the services ecosystems provide to humanity. High‑confidence research links habitat loss, climate change, pollution, and overexploitation to these losses, while uncertainties remain about future trajectories and the full potential of restoration. Solutions exist—protected areas, sustainable resource management, emissions reductions—but each carries costs, implementation challenges, and trade‑offs. Collective action across individuals, communities, industry, and governments offers the most realistic path to halt and eventually reverse biodiversity loss.