Exclusive: A leading conservation research group found that 40% of animals and 34% of plants in the United States are at risk of extinction, while 41% of ecosystems are facing collapse
"If we want to maintain the panoply of biodiversity that we currently enjoy, we need to target the places where the biodiversity is most threatened," O'Brien said. "This report allows us to do that."
Nearly half of all cacti species are at risk of extinction, while 200 species of trees, including a maple-leaf oak found in Arkansas, are also at risk of disappearing. Among ecosystems, America's expansive temperate and boreal grasslands are among the most imperiled, with over half of 78 grassland types at risk of a range-wide collapse.
Knapp highlighted the threats facing plants, which typically get less conservation funding than animals. There are nearly 1,250 plants in NatureServe's "critically imperiled" category, the final stage before extinction, meaning that conservationists have to decide where to spend scant funds even among the most vulnerable species to prevent extinctions.
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