UNESCO sites act as powerful shields against biodiversity loss, climate change: Report

UNESCO-designated sites—long celebrated for their cultural and natural value—are now emerging as critical buffers against biodiversity loss and climate change, according to a new global assessment.

Titled People and Nature in UNESCO-designated Sites: Global and local contributions, the report presents a compelling idea: protecting nature ultimately protects people. It is the first study to examine all of UNESCO’s conservation categories—World Heritage Sites, Biosphere Reserves and Global Geoparks—as one interconnected system.

Together, these 2,260+ sites span over 13 million square kilometres—larger than China and India combined—and support nearly 900 million people, about 10% of the global population.

A living system of people and nature

Rather than isolated protected zones, the report describes these areas as “living systems” where ecosystems and communities coexist.

Examples span the globe—from the Serengeti-Ngorongoro region in Tanzania, where wildlife conservation aligns with Maasai traditions, to Mexico’s Tehuacán-Cuicatlán Valley, where indigenous farming sustains biodiversity. Along the Qhapaq Ñan across South America, and on Jeju Island, traditional lifestyles remain deeply connected to surrounding ecosystems.

These examples highlight a key insight: conservation is most effective when local communities are active stewards, not excluded participants.

Biodiversity strongholds amid global decline

The report reveals a stark contrast between global biodiversity trends and those within UNESCO sites. While global wildlife populations have declined sharply since 1970, populations within these protected areas have remained largely stable.

These sites now host over 60% of mapped global species and safeguard significant populations of iconic wildlife like elephants, tigers, and pandas. They also provide refuge to critically endangered species such as the vaquita, Javan rhino, and pink iguana.

Their environmental role is equally vital. UNESCO-designated areas include around three million square kilometres of Key Biodiversity Areas and absorb roughly 700 million tonnes of carbon dioxide annually—comparable to the yearly emissions of Germany. They also regulate water systems, stabilise coastlines, and protect communities from extreme weather.

Rising climate threats

Despite their resilience, these landscapes are under growing pressure. Nearly 98% of UNESCO sites have experienced at least one extreme climate event since 2000, with heatwaves, rising seas, coral bleaching, wildfires, and droughts among the key threats.

The impacts are already visible. Glaciers within these sites have lost more than 2,500 gigatonnes of ice, while coral reefs face the risk of annual bleaching that could lead to ecosystem collapse.

The report warns that without urgent action, more than one in four UNESCO sites could reach critical tipping points by 2050. However, limiting global warming could significantly reduce these risks.

Cultural and economic significance

Beyond ecology, these sites are cultural and economic pillars. Over 1,000 languages—around 15% of the world’s total—are spoken within these regions, many tied to indigenous knowledge systems. About a quarter overlap with Indigenous territories.

Economically, areas containing UNESCO sites contribute roughly 10% of global GDP. Tourism is a major driver, with World Heritage Sites alone attracting an estimated 1.5 billion visitors annually.

A model for the future

The report underscores UNESCO’s integrated approach: protecting heritage, supporting sustainable development, and empowering communities. About one-third of these sites carry multiple designations, enabling a holistic model that blends ecological, cultural, and geological conservation.

Ultimately, the findings present both a success story and a warning. UNESCO-designated sites demonstrate that coexistence between people and nature is possible—but scaling and sustaining this model amid accelerating global crises remains the defining challenge.