Today, in an opinion authored by Justice Liu, the California Supreme Court ruled that the greenhouse gas analysis in an environmental impact report (“EIR”) prepared for the San Diego Association of Government’s (“SANDAG”) regional transportation plan (“RTP”) did not violate the California Environmental Quality Act (“CEQA”), but did little to resolve uncertainties in addressing climate change issues under CEQA. As we previewed in our May discussion of the oral argument in this case, Cleveland National Forest Foundation v. San Diego Association of Governments, the majority of the Court found that SANDAG’s discussion of the impacts of greenhouse gas emissions was adequate given the state of science and guidance, at least at the time of the issuance of the RTP in 2011. The Supreme Court cautioned, however, that this EIR should not be considered a template for future projects as developing science and regulations will likely provide further guidance on this issue.