A tenth of the world's wilderness lost since the 1990s

Published: Thursday,9月8日,2016 - 14:39 inEarth & Climate


Liana Joseph

Researchers reporting in the Cell Press journalCurrent Biologyon September 8 show catastrophic declines in wilderness areas around the world over the last 20 years.They demonstrate alarming losses comprising a tenth of global wilderness since the 1990s - an area twice the size of Alaska.亚马逊和中非遭受了最严重的打击。The findings underscore an immediate need for international policies to recognize the value of wilderness and to address the unprecedented threats it faces,研究人员说。

"Globally important wilderness areas--despite being strongholds for endangered biodiversity,for buffering and regulating local climates,and for supporting many of the world's most politically and economically marginalized communities--are completely ignored in environmental policy," says James Watson of the University of Queensland in Australia and the Wildlife Conservation Society in New York."International policy mechanisms must recognize the actions needed to maintain wilderness areas before it is too late.We probably have one to two decades to turn this around."

Watson says much policy attention has been paid to the loss of species,but comparatively little was known vwin徳赢app下载about larger-scale losses of entire ecosystems.To fill that gap in the new study,研究人员绘制了世界各地的荒野区域图,with "wilderness" being defined as biologically and ecologically intact landscapes free of any significant human disturbance.The researchers then compared their current map of wilderness to one produced by the same means in the early 1990s.

他们更新后的地图显示,总面积为3010万平方公里(占世界陆地面积的20%以上)现在仍然是荒野,with the majority being located in North America,North Asia,北非and the Australian continent.However,comparisons between the two maps show that an estimated 3.3 million km2 (almost 10 percent) of wilderness area has been lost in the intervening years.Those losses have occurred primarily in South America,已经经历了30%的荒野损失,and Africa,which has experienced a 14 percent loss.

"The amount of wilderness loss in just two decades is staggering and very saddening," Watson says."We need to recognize that wilderness is being dramatically lost and that without proactive global interventions we could lose the last jewels in nature's crown.You cannot restore wilderness.Once it is gone,the ecological process that underpin these ecosystems are gone,它永远不会回到原来的状态。The only option is to proactively protect what is left."

Watson says that the United Nations and others have ignored globally significant wilderness areas in key multilateral environmental agreements,but that has to change.

"If we don't act soon,it will be all gone,这是保护环境的灾难,for climate change,and for some of the most vulnerable human communities on the planet," Watson says.“我们有责任为我们的孩子和他们的孩子采取行动。”



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