National Environmental Policy Act (NEPA) analyses and Endangered Species Act (ESA) Section 7 consultations are high on the list of project time, cost and risk drivers. The impact of these environmental reviews on projects often turns on the scope of those reviews, which in turn depends on determining which effects will be caused by the action. In August 2019 the US Fish and Wildlife Service and National Marine Fisheries Service established, for the first time, a regulatory causation standard governing ESA section 7 consultations, and, in January 2020, the Council on Environmental Quality proposed a new regulatory causation standard governing NEPA reviews.
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