The regulatory takings jurisprudence of the U.S. Supreme Court has become an ungainly body, awkward for citizens and judges to apply and challenging as well, one might guess, for the Court itself, as it continues to reshape the law to better serve its aims. One cause of this predicament: leading decisions have arisen from peculiar facts and messy procedural contexts, yielding rulings that are hard to apply elsewhere. Another cause: the divergent views of Court members on the deference properly due the work of land use regulators.

To the extent the city argues that, as a matter of law, its landuse decisions are immune from judicial scrutiny under all circumstances, its position is contrary to settled regulatory takings principles. We reject this claim of error.

Improperly planned urban development has resulted in catastrophic sprawl. The present land use zeitgeist hails urban and suburban mixed-use zoning as the solution. Mixed-use zoning combines—rather than segregates—residential, commercial, and sometimes industrial land uses, and thereby decreases housing costs, decreases commuting periods, decreases vehicle miles traveled and air emissions, increases the efficient use of land and time, and increases consumer convenience.

Smart Growth admits of no clear definition. It provides a popular label for a growth strategy that addresses current concerns about traffic congestion, disappearing open space, nonpoint source pollution, the high cost of housing, increasing local property taxes, longer commutes, and the diminishing quality of community life. To accomplish smart growth, government must take two related actions. The first is the designation of discrete geographical areas into which private market growth pressures are directed.

In the west Chicago suburb of Sugar Grove—population 4,000, twice what it was 10 years ago—new large-lot developments spread spider-like from the downtown public library, police station, and village hall out into open farmland. The village has no sizeable employers or large shopping centers, and has limited recreational facilities. All those things are available close by in other suburbs and, of course, in the city of Chicago. After elementary school, children travel to neighboring suburbs for high school.

Timothy S. Bishop and Cristina C. Tilley, litigators in the Chicago office of Mayer, Brown, Rowe & Maw, offered up a Dialogue in the July 2002, issue of the Environmental Law Reporter News & Analysis entitled Smart Growth or Dumb Bureaucracy? They didn't cite the Article I wrote with my law partner of 25 years, Gurdon H. (Don) Buck, Smart Growth, Dumb Takings, which was also published in this august periodical. I don't think we own the form of the title beginning with "Smart" and linked to "Dumb," but it would have been nice to have been recognized.

The preservation of open space has captured the public's imagination. Taxpayers are lining up to vote in favor of referenda authorizing their local or state governments to borrow funds to purchase open land or its development rights. Environmental groups are forming coalitions to support public acquisition of open space and the adoption of laws regulating development in and around open lands. Opponents of urban sprawl target the loss of open space as one of the major impacts of runaway development.

Friends of the Earth, Inc. v. Laidlaw Environmental Services (TOC), Inc. may prove to be the most important environmental decision since Chevron, U.S.A., Inc. v. Natural Resources Defense Council. Laidlaw's primary significance lies in its discussion of the injury component of the U.S. Supreme Court's now familiar three-part standing test.

In its first week of business during the new millennium, the U.S. Supreme Court decided Friends of the Earth, Inc. v. Laidlaw Environmental Services (TOC), Inc., and provided important clarifications about the law of standing in environmental citizen suits. Specifically, the Court rejected the narrow view of environmental injury-in-fact advocated by Justice Scalia and instead adhered to the broader view of injury-in-fact established in a nonenvironmental context by the Court's decision in Federal Elections Commission v. Akins.

As law students frequently discover during exams, the law of standing is easy to state but hard to apply. The basic rules are simple and well-settled. Under Article III of the U.S. Constitution, in order to invoke federal jurisdiction, the plaintiff must demonstrate the existence of an "injury-in-fact" that is "legally cognizable," "fairly traceable" to the defendant, and capable of being "redressed" by the court. Each of the terms in quotation marks seems clear enough on the surface but has proved remarkably tricky in practice.