Aransas Project v. Shaw presented a challenge to an injunction against the Texas Commission on Environmental Quality, prohibiting the TCEQ from issuing new permits to withdraw water from rivers that feed the estuary where whooping cranes live. No. 13-40317 (June 30, 2014). The whooping crane, described in the opinion as a “majestic bird that stands five feet tall,” is an endangered species, and the only known wild flock lives in Texas during winter.
The Fifth Circuit first rejected an argument for Burford abstention, finding that this case presented a “broader grant of administrative and judicial authority by state law to remedy environmental grievances” than a prior opinion where it allowed abstention in a similar sort of environmental dispute. Cf. Sierra Club v. City of San Antonio, 112 F.3d 789 (5th Cir. 1997).
The Court then reversed the injunction, finding no causation “in the face of multiple, natural, independent, unpredictable and interrelated forces affecting the cranes’ estuary environment.” While couched in language about proximate causation and environmental law, the Court’s analysis is a classic illustration of the recurring Daubert problem of excluding alternate causes. (In the course of this discussion, the butterfly effect theory makes a cameo appearance in footnote 10.)