The courts
Which federal courts decide environmental cases
The subject of an environmental dispute does not identify the court that may hear it. Jurisdiction and the stage of review explain each court’s role.
The court's task determines the kind of record
An environmental case may concern facts about a disputed activity, the interpretation of a statute, the legality of an agency rule or a demand for compensation from the federal government. These questions do not all begin in the same institution. A court's name and its jurisdiction identify what it may decide. Its place in the review process identifies whether it is resolving the dispute initially or examining a decision already made.
The U.S. Courts account of court role and structure describes district courts as the institutions that determine facts and apply law, and it identifies 13 courts of appeals below the Supreme Court. It explains appellate review as examination of whether law was applied correctly in a trial court or federal administrative agency. This distinction supplies the starting point for reading an environmental decision: the reader needs to know both the legal question and the institution that answered it.

District courts: facts and applicable law
District courts are the general trial courts in the federal system. Their work connects a dispute's factual setting with the governing law. A legal description at this stage must keep the factual issue separate from the rule applied to it. Whether an activity occurred, what the relevant record establishes and what a statute requires are different parts of the inquiry. The result cannot be described accurately by giving the case name alone.
The trial function also explains why a later appellate decision is not simply a second account of the same proceeding. The first court's role includes resolving the dispute by applying law to facts. Review asks about the correctness of that legal work. A reference to the courts therefore distinguishes the procedural stage from the subject matter. Water, air or habitat may identify the subject; trial or appeal identifies the court's task.
Courts of appeals: reviewing decisions
The courts of appeals sit between trial courts and the Supreme Court. The U.S. Courts explanation includes both trial-court decisions and decisions of federal administrative agencies in its account of appellate review. This is important in environmental law because the decision under review may come from an agency rather than from a trial judgment. The word appeal by itself does not establish that a district court considered the dispute first.
The D.C. Circuit page explains that court's place in challenges to agency rules. The Ninth Circuit page considers a different institutional question: proposals to change the organization of an appellate circuit. A court's review responsibilities and a proposal about its structure are distinct topics, even when both concern the same judicial level.
Reconsideration within an appeals court
Wikipedia's explanation of en banc proceedings distinguishes the ordinary smaller appellate panel from reconsideration by a broader body of the court's judges. It describes en banc review as a procedure used to address especially important issues or maintain consistency within a circuit. It also notes that circuits have their own rules and that a larger court may use a limited en banc body.
En banc review is therefore not another tier of the federal judiciary. It is a form of consideration within an appellate court. A panel decision, a request for rehearing and a decision after rehearing describe different procedural events. The existence of a request does not establish that rehearing occurred. Nor does the use of a broader judicial body, by itself, say which interpretation of an environmental statute prevailed.
Federal claims: a specialized question about money
Wikipedia's account of the Court of Federal Claims describes a federal court with jurisdiction over monetary claims against the United States, including claims for compensation for takings. It identifies this court as an Article I tribunal and explains that its judgments are reviewed by the Federal Circuit. The specialized subject of a claim, rather than its environmental setting alone, determines why this court enters the account.
A takings claim asks a compensation question that is distinct from a request to set aside an agency rule. The takings page explains the constitutional and doctrinal questions behind such claims. Describing the Court of Federal Claims as a general forum for all environmental disputes would erase the limits of its jurisdiction. Its role is more precise: certain demands for money against the federal government fall within its statutory authority.
Supreme Court review is selective
Wikipedia's article on certiorari describes the Supreme Court's discretionary selection of cases, including questions on which appellate circuits differ. Its account emphasizes that granting review does not itself establish disagreement with the lower court, and that denying review does not express approval of the merits. The Court selects a limited docket rather than providing a further hearing in every dispute.
A petition, a grant of review and a final holding must consequently be described separately. A lower-court decision may remain the operative result without the Supreme Court deciding the question. The standing and citizen-suit page addresses another prerequisite: whether a party may bring a dispute to court. Together, jurisdiction, access and review explain how an environmental question reaches a particular judicial decision.