The fate of the Endangered Species Act rests on 2 simple words

by | Sep 22, 2026 | Climate Change

The fate of the Endangered Species Act rests on 2 simple words

The Endangered Species Act, which has protected wildlife since 1973 and facilitated recovery of species such as bald eagles and humpback whales, faces significant constraints from recent administrative actions. This week, the U.S. Fish and Wildlife Service issued guidance stating that unintentional killing of federally protected animals is now lawful. Simultaneously, a revision to the law’s definition of “harm” removed habitat damage from its scope, fundamentally altering how the statute functions as a conservation tool.

The changes pivot on the interpretation of two words central to the law’s enforcement: “harm” and “take.” A memo signed by Fish and Wildlife Service Director Brian Nesvik provided narrow definitions, including examples that a vessel unintentionally striking a whale would not constitute a “take” and that felling a tree does not harm bats roosting within it unless killing the bats was intentional. Legal scholars and conservation advocates contend this represents an unprecedented departure from five decades of consistent interpretation. Nearly two dozen states have already filed lawsuits challenging the revisions, with additional litigation from environmental organizations anticipated.

Historical precedent weighs against the administration’s position. In the 1995 Supreme Court case Babbitt v. Sweet Home, the court ruled that habitat modification qualifies as harm under the law, a decision that protected northern spotted owls from logging operations in the Pacific Northwest. The current administration’s approach aligns with a dissenting opinion from that case rather than the majority ruling. Additionally, a 2024 Supreme Court decision granted courts, rather than agencies, final authority in interpreting statute language, potentially limiting the Fish and Wildlife Service’s ability to unilaterally redefine these terms.

The practical implications extend to industrial operations across multiple sectors. Environmental groups argue that unintentional species harm drives extinction, contradicting the new framework’s focus on intent. Conversely, some legal observers note that the changes create regulatory uncertainty for businesses that have operated under settled rules for decades, potentially making long-term planning more difficult for timber corporations and real estate developers despite the apparent deregulation.

Conservation attorneys expect swift legal challenges to reach courts, where the decades-long interpretation of the Endangered Species Act’s core provisions will be tested against the administration’s narrower definitions.

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