As many as one in five species around the world are in danger of extinction.
A 2019 UN report sent shockwaves through the conservation community when it stated that more than one million animal and plant species stand on the brink of extinction. Although the exact number of species is unknown today, some scientists estimate it at 5.3 million. This accelerating rate of decline substantiates scientists’ predictions of a new mass extinction, defined as a 75% loss in Earth’s species within a short geological time span. Earth has suffered five such events in the last 450 million years, most caused by some variety of catastrophic climate change. This time, according to scientists, it is not predominantly climate change per se (although it contributes), but instead largely due to human agriculture and other activities disrupting habitats and ecosystems.
In recent decades many governments have taken steps to restore species richness. Conservation strategies such as protected areas, invasive alien species management, and hunting limitations, have helped mitigate biodiversity loss. The North American Bald Eagle was rescued from the brink beginning with the banning of toxic DDT in 1972. The Indus River Dolphin has recovered from numbers as low as 1,200 in 2001 to1,800 today, thanks to increased monitoring, education of fishing communities, and ecotourism.
Yet these efforts are fragile, and at best protect only a small fraction of endangered species. At the end of September, U.S. federal wildlife officials declared the extinction of 23 more plant and animal species, despite their protection under the 1973 Endangered Species Act. Even the Mountain Gorilla, practically eponymous with the cause of conservation, is barely hanging on with a population of 1,000, despite decades of intense protection. Ultimately, as the 2019 UN report recommends, systematic changes in human land use, such as sustainable intensification of existing farmland or bio-sensitive urban development, will be required if we are to slow the rate of extinction.
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