New Delhi: UNESCO-designated sites, long seen as symbols of cultural and natural heritage, are also serving as some of the world’s most effective buffers against biodiversity loss and climate change, states a new global assessment.
The report, People and Nature in UNESCO-designated Sites: Global and local contributions, suggests a simple, but powerful idea: when nature is protected, it protects people back.
Released earlier this month, the study is the first to analyse all UNESCO’s conservation categories—World Heritage sites, Biosphere Reserves and Global Geoparks—as a single interconnected system. Together, they form a network of more than 2,260 sites spanning over 13 million square kilometres, an area larger than China and India combined, and supporting around 900 million people worldwide, roughly 10 per cent of the global population.
Rather than isolated protected areas, the report describes these landscapes as a living system where ecosystems and human societies are deeply linked, and where conservation is not about exclusion but coexistence.
Co-existence of ecosystems & humans
Across continents, the report points to examples of this relationship in action. In Tanzania’s Serengeti-Ngorongoro landscape, wildlife conservation coexists with Maasai pastoral traditions. In Mexico’s Tehuacán-Cuicatlán Valley, indigenous agricultural practices continue to sustain both biodiversity, livelihoods and culture. Along the Andean Qhapaq Ñan road network in six South American countries, traditions remain tied to the surrounding ecosystems. At the same time, in South Korea’s Jeju Island, unique marine biodiversity and volcanic landscapes coexist with centuries-old practices of haenyeo women divers.
These cases, the report suggests, show how conservation works best when communities are active stewards rather than excluded from the landscapes they depend on.
One of the report’s most striking findings is the divergence between global biodiversity trends and those within UNESCO-designated sites. While monitored wildlife populations worldwide have declined by 73 per cent since 1970, populations within these sites have remained stable on average.
Today, these areas contain more than 60 per cent of globally mapped species and support nearly a third of the remaining populations of iconic wildlife such as elephants, tigers and pandas. They also provide refuge to critically endangered species, including the vaquita, Javan rhino and pink iguana.
The ecological importance of these sites is also vast. UNESCO-designated sites include about three million square kilometres of Key Biodiversity Areas—regions critical for conservation. The area is roughly equivalent to India. Their role extends beyond biodiversity. Collectively, these sites absorb around 700 million tonnes of carbon dioxide annually, comparable to Germany’s yearly fossil fuel emissions. They also regulate water systems, stabilise coastlines, and buffer communities from extreme weather.
However, even as these landscapes demonstrate resilience, the report warns that they are under mounting pressure. Nearly 98 per cent of UNESCO-designated sites have experienced at least one extreme climate event since 2000, with extreme heat emerging as the most widespread hazard. Other threats include heavy rainfall, rising sea levels, coral bleaching, droughts, wildfires, pollution, invasive species, water stress and landslides, highlighting the range of risks now confronting even the most protected ecosystems.
The physical impacts of climate change are already visible. Glaciers within UNESCO-designated sites have lost more than 2,500 gigatonnes of ice since 2000, with mountain glaciers shrinking by around 9 per cent in volume. Marine ecosystems are also under strain, with tropical coral reefs facing the possibility of annual bleaching events that could lead to their functional collapse.
The report warns that without urgent action, these pressures could push ecosystems beyond recovery. More than one in four UNESCO-designated sites could reach critical tipping points by 2050, potentially undermining both biodiversity and the communities that depend on them.
At the same time, it outlines a clear pathway forward. Limiting global warming could significantly reduce these risks, with every one degree Celsius of global warming avoided potentially halving the number of sites exposed to major disruption by the end of the century.
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World Heritage sites attracts 1.5 billion visitors
Beyond ecology and climate, the report highlights the cultural and economic weight of these landscapes. More than 1,000 languages, around 15 per cent of the world’s total, are spoken within UNESCO-designated sites, many of them indigenous languages closely tied to traditional knowledge systems. At least a quarter of these sites overlap with Indigenous peoples’ lands and territories, reinforcing their role as spaces where cultural heritage and conservation intersect.
Economically, their footprint is equally significant. Around 10 per cent of global GDP is generated in areas containing UNESCO-designated sites. These are also tourism hotspots, with World Heritage sites alone attracting an estimated 1.5 billion visitors each year. The report, however, emphasised that many of the most profound impacts on these sites involve non-economic losses, including erosion of cultural identity, weakened social cohesion and the loss of indigenous and local knowledge, and thus requires sustained investment.
This mix of ecological, cultural and economic value is underpinned by UNESCO’s layered approach to conservation. World Heritage sites focus on protecting areas of “Outstanding Universal Value,” Biosphere Reserves integrate conservation with sustainable development, and Global Geoparks emphasise geological heritage alongside community-led growth.
In many cases, these designations overlap. About one-third of UNESCO-designated sites carry multiple labels, allowing ecological, cultural and geological dimensions to be managed together. The report strongly emphasises that such an integrated approach, one that offers a more holistic alternative to traditional conservation approaches that separate people from nature, is the only way forward.
Taken together, the report positions UNESCO-designated sites as both a success story and a warning. As global crises deepen, these landscapes offer a working example of what is possible. The question, the report suggests, is whether that model can be scaled and sustained before the pressures they face begin to overwhelm them.
(Edited by Saptak Datta)