A BOOM in world tourism is posing a huge threat to some of the planet’s most sensitive ecosystems.

This was according to a study released recently, by Conservation International (CI) and the United Nations Environment Program (UNEP). The study says that tourism rose by more than 100 per cent between 1990 and 2000 in the world’s “biodiversity hotspots,” which include the tropical Andes and the Guinean forests of West Africa.

CI has identified 25 such areas, which contain 44 per cent of all identified endemic plant species and 35 per cent of all known endemic species of birds, mammals, reptiles and amphibians.

The hotspots cover only 1.4 per cent of the planet’s land area and all been significantly altered by human activities.

“In some places the growth (in tourism) has been staggering,” CI and UNEP said in a statement released at the fifth World Parks Congress in the South African port city of Durban.

“Over the past decade, tourism has increased by more than 200 per cent in both Laos and Cambodia, nearly 500 per cent in South Africa, over 300 per cent in Brazil, Nicaragua and El Salvador,” it said. Costas Christ of CI, one of the report’s authors, said that tourist development in ecologically sensitive areas often severely damages its main attraction — the environment.

“Many of these developments are in arid countries and so the limited water supply comes under pressure...and if development ultimately kills off the environment then tourists have no incentive to come,” he said.

The report highlighted the Mexican resort of Cancun, where world trade talks are being held, as an example of unsustainable tourism which is impacting negatively on the environment.

“Prior to its development as a tourist resort in the 1970s, only 12 families lived on the barrier island of Cancun,” it said.

Now, the resort has 2.6 million visitors per year, the local mangrove and inland forests have been cut down, and in the settlement that has grown nearby, 75 per cent of the sewage of the population is untreated.

Tourism is often said to benefit the environment by creating jobs and other opportunities for poor rural communities who might otherwise exploit local natural resources for survival.