Since the 1990s, our planet has lost nearly three million square kilometers of wilderness areas – parts of the world where human impact has been absent or minimal, according to a study which found that conserving such regions can cut the Earth’s extinction risk by half. The research, published in the journal Nature, found that more than 10 percent of the planet’s wilderness has been destroyed since the 1990s – an area about the size of India. The authors of the study, including those from, the University of Queensland in Australia, cautioned that only less than 20 percent of the world’s current area can still be called wilderness, of which, many are found outside of national parks and other protected areas. The direct benefits of wilderness for stopping species extinction were largely unknown previously, according to the study.
The researchers made use of the new global biodiversity modeling infrastructure – BILBI – developed at the Commonwealth Scientific and Industrial Research Organization (CSIRO) headquartered in Australia, which can provide fine-scale estimates of species loss around the globe. By integrating this with the latest human footprint map, the scientists showed that many wilderness areas are critical to prevent the loss of terrestrial species in several parts of the world. “Wilderness areas clearly act as a buffer against extinction risk, the risk of species loss is over twice as high for biological communities found outside wilderness areas,” said Moreno Di Marco of CSIRO and lead author of the study. Marco added that wilderness habitats made an even greater contribution in sustaining biodiversity since some species can exist both inside and outside them. Such areas are essential to support many species that may otherwise have to live in degraded habitats, he said.
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