|CEQA / GHG Impacts Analysis|
GHG Impacts Analysis
|The California Global Warming Solutions Act of 2006 (Assembly Bill 32) requires the California Air Resources Board (ARB) to facilitate substantial greenhouse gas (GHG) emissions reductions, both from within the state and from imported electric power generated in other states. The goal of AB 32 is to reduce statewide GHG emissions to 1990 levels by 2020. This will be achieved by cutting about 30 percent from “business-as-usual” emission levels projected for 2020. In 2007, the state legislature passed Senate Bill 97, which required amendments to the California Environmental Quality Act (CEQA) Guidelines to incorporate analysis of, and mitigation for, GHG emissions from projects subject to CEQA.
The CEQA Guidelines do not contain statewide quantitative thresholds of significance for GHG impacts; establishing numeric thresholds has been delegated to each of California’s 35 air districts. However, in lieu of meeting a quantitative threshold, the Guidelines state that a project may be found to have a less than significant impact on climate change if it complies with an adopted plan – typically at the county or district level – that includes specific measures to limit future GHG emissions to substantially less than business-as-usual.
Most California air districts have adopted some form of GHG mass emissions thresholds expressed in the international units of metric tons per year of carbon dioxide equivalents (MT/yr CO2e). These thresholds can vary from district to district, and can comprise different thresholds for permitted stationary/industrial sources versus land use projects such as housing developments, office buildings, and shopping centers. Instead of stack emissions, land use projects generate direct and indirect GHG emissions – mainly via motor vehicle traffic and utilities consumption. This latter category is the focus of most CEQA GHG impact assessments conducted for the private sector.
Many California cities and counties have updated general plan conservation elements or have developed “climate action plans” to include goals and policies designed to address air pollution and GHGs. Typical goals and policies apply to land use projects – not stationary sources – and tend to focus on sustainability topics including improvements to the transportation system, reducing long distance commuting, encouraging and supporting non-auto transportation, and reducing future land use conflicts related to air pollution. While many goals and policies are geared toward criteria pollutants, such as ozone and particulate matter, implementation of such goals and policies also benefits efforts to reduce GHG emissions.
While required in CEQA analyses, the content and complexity of GHG evaluations are evolving continuously through agency actions and CEQA practice precedents. Yorke Engineering, LLC (Yorke) keeps abreast of current requirements in the major California air districts in order to conduct GHG impact analyses that are approvable by Lead Agencies consistent with AB 32 and SB 97. Pursuant to the current Guidelines, project-related GHG emissions impacts – both direct and indirect – must be estimated for short-term construction and long-term operation for a CEQA analysis to be approved: