California Climate Investments GHG Quantification Research
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Periodically, California Air Resources Board’s (CARB) staff or in partnership with university research will develop reports utilizing existing research to propose updates to current quantification methods and potential new methods for estimating greenhouse gas (GHG) emission reductions from potential projects funded by California Climate Investments programs. The literature review and reports listed in the tables below present research outcomes to inform potential updates to the CARB existing methodologies and the development of new methodologies for estimating GHG emission reductions and co-benefits at the project level.
The results of the research conducted by University of California, Davis are presented in two papers for each topic area: a summary report and a detailed technical documentation report.
Literature reviews aim to determine if the project type is currently feasible in California or may become so within 1-5 years and whether the project type results in GHG emission reductions and co-benefits. The literature reviews provide a recommendation if the project can be quantified at a project level, whether methods to quantify benefits current exists, or what research gaps should be addressed.
Note: These reports present research findings on quantification methods for California Climate Investments programs and are not intended for use in other programs.
Eelgrass Restoration and Conservation | ||||
Description: CARB reviewed the current state of knowledge around the potential climate benefits associated with both conservation and restoration of intertidal eelgrass wetlands in the State, identifying data gaps that should be addressed with new research before a quantification method can be developed. With improved certainty, a quantification method could be developed. | ||||
Bicycle Facilities | ||||
Description: Researchers propose several updates to factors used in existing methods for estimating vehicle miles traveled (VMT) reductions from new bike paths, lanes, and cycle tracks, and propose a new method using bicycle count data in lieu of average daily traffic. | ||||
Car Share, Bike Share, and Scooter Share Services | ||||
Description: Researchers propose several updates to average trip length and adjustment factors used in existing methods for estimating VMT reductions from car share, bike share, and scooter share services. | ||||
Manure Management | ||||
Description: Researchers evaluated and provided recommendations for improvement of emission factors related to manure deposition and solids separation, including time budgets for cows and manure deposition locations, solid separators, weeping wall systems, aerobic treatment (lagoons), and gasification systems. | ||||
Pedestrian Facilities | ||||
Description: Researchers propose several updates to factors used in existing methods for estimating VMT reductions from new pedestrian facilities, and propose a new method using pedestrian count data in lieu of average daily traffic. | ||||
Transit Factors | ||||
Description: Researchers propose several updates to factors used in existing transit and connectivity (TAC) methods. The first, an “A” factor, is used to account for transit dependency in estimating ridership gains. The second, an “L” factor, is a required input for the estimated length of an average unlinked transit passenger trip associated with the proposed project. | ||||