But species typically need at least a half-century to recover and most haven't been listed that long, said Noah Greenwald, endangered species director with the Center for Biological Diversity, an environmental group.
After helping prevent extinctions for 50 years, the Endangered Species Act itself may be in peril
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Still pending, he said, are expected changes to a Trump-era a rule that reduced protections for wildlife categorized as threatened with extinction, a less urgent protection status than endangered.
Wildlife agencies to cancel Trump endangered species rules
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