A district court denied two aviation associations' motions to intervene in a case asking the court to order EPA to use its authority under the CAA to regulate greenhouse gas emissions from…

The Tenth Circuit affirmed a lower court decision denying a Native American tribe's motion to intervene in a dispute between Oklahoma and a poultry company regarding the company's…

The Tenth Circuit affirmed a lower court’s denial of environmental groups’ motion to intervene in a county action against the United States to quiet title to several purported…

The Tenth Circuit reversed a lower court decision denying a railroad company's motion to intervene in the United State's CERCLA §107 action against 44 PRPs concerning a hazardous waste…

The Tenth Circuit held that the owner of an underground coal mine may intervene in an environmental group's NEPA action concerning the U.S. Forest Service's approval of venting of…

The Ninth Circuit denied a petition for review of a FERC decision denying environmental groups' motion to intervene in a license renewal proceeding for a dam. Although the groups' motion…

The Eighth Circuit affirmed a lower court decision denying a business trade association's motion to intervene in a CWA enforcement action filed against a local sewer district by Missouri and…

A district court held that the West Virginia Department of Environmental Protection may intervene in environmental groups' lawsuit challenging the DOI Secretary's approval of two…

A California appellate court held that a property owner may not intervene in an insurance coverage dispute between an insurance company and the former property owner from which the current owner…

A district court held that a nonsettling potentially responsible party (PRP) may intervene in a consent decree between the United States and settling PRPs concerning the reimbursement of response…