In Cleveland National Forest Foundation v. County of San Diego (2025) 109 Cal. App.5th 1257, the Fourth District Court of Appeal invalidated two thresholds of significance adopted by the County of San Diego (“County”) that in certain circumstances would have avoided the need for a project proponent to perform an analysis of vehicle miles travelled.

In September 2021, the Third District Court of Appeal in Sierra Watch v. Placer County(Cal. Jan. 19, 2022) reversed a judgement upholding Placer County’s Environmental Impact Report (EIR) for a resort development project in the Olympic (formerly Squaw) Valley area. In the published portion of the opinion, the court found errors in the EIR’s

In Ass’n of Irritated Residents v. United States EPA (9th Cir. 2012) 686 F.3d 668,  the Ninth Circuit granted a petition challenging federal Environmental Protection Agency’s (EPA) decision to approve the 2003 SIP Revision on each of the three grounds alleged by the Petitioner.  Specifically, Petitioner alleged (1)EPA’s failure to order California to submit a