Invasive species, climate change and tourism impacts the greatest threats to natural World Heritage

IUCN invasive species blogA new report from the IUCN looks at conservation prospects, threats, protection and management of natural World Heritage sites. The IUCN World Heritage Outlook 2 summarises the key trends in the state of conservation of natural World Heritage sites, the threats and pressures they are facing, and the effectiveness of their protection and management. The top three current threats are all areas in which CABI works, with invasive species, climate change and tourism impacts, in that order, being assessed as the most significant threats to natural World Heritage.

As of November 2017, there are 241 natural and mixed (both cultural and natural) World Heritage sites, representing about 0.1% of the total number of protected areas globally, yet with a total coverage of 294 million hectares, accounting for 8% of the combined surface of terrestrial and 6% of marine protected areas. The IUCN World Heritage Outlook 2 – an update of the 2014 IUCN World Heritage Outlook report – assesses, for the first time, changes in the conservation prospects of all these sites. Sites on the World Heritage list are earmarked for protection for future generations. Countries assume responsibility under the World Heritage Convention to protect listed sites within their borders, but the report cites insufficient funding as a major cause of deterioration in management of the sites since 2014.

According to the assessments, climate change impacts, such as coral bleaching and glacier loss, affect a quarter of all sites – compared to one in seven sites in 2014 – and place coral reefs and glaciers among the most threatened ecosystems. Other ecosystems, such as wetlands, low-lying deltas, permafrost and fire sensitive ecosystems are also affected. The report warns that the number of natural World Heritage sites affected by climate change is likely to grow further, as climate change remains the biggest potential threat to natural world heritage.

While climate change is the fastest growing and greatest potential threat, the most significant current threat is given as invasive species, with tourism in third place behind climate change. Since 2014, the number of sites where invasives and tourism are reported as high or very high threats has continued to increase (nearly 14% more sites are now affected by invasive species and 10% by tourism impacts than in 2014). Infrastructure development is also one of the top potential threats, with tourism development being one of the specific components within this. The number of sites which could be significantly affected by construction of tourism facilities has risen from 11 to 15 since 2014.

The overall effectiveness of protection and management of natural World Heritage sites has decreased since 2014. The percentage of sites where protection and management are assessed as overall “effective” or “highly effective” has declined from 54% in 2014 to 48% in 2017, when comparing the 228 sites for which two assessments are available. This combination of increasing threats and less effective protection and management presents a clear risk to the World Heritage values of the sites, and calls for greater attention to protect these world class sites. Tourism and visitation management is given as being of “some or serious concern” for about 90 sites, and as being “highly effective” only in just over 30.

The regional breakdown of threats is interesting given the current concerns about ‘overtourism’ in parts of Europe in particular. In Europe, tourism, visitors and recreation are given as the most common high or very high threat to natural World Heritage sites, ahead of water pollution and then invasive species. Impacts from tourism are also the most widespread current threat in Asia, followed by hunting. Legal and illegal hunting are the most widespread threat in Africa.

Invasive alien species are given as by far the greatest current threat to natural World Heritage sites in Oceania, well ahead of climate change in second place and tourism in third. Invasive species are also the most widespread threat to natural heritage in North America.

CABI is actively involved in control of invasive species, and also publishes the open access Invasive Species Compendium, with over 2000 full datasheets on invasive species worldwide, as well as a wide range of other content including specially selected full text articles. We also publish the most comprehensive database of tourism research, while our Environmental Impact website documents human impacts on the environment, from climate change to biodiversity loss.

Written by David Simpson, Content Editor, Leisure Tourism, CABI

A re-post from CABI’s Handpicked blog

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