Research Projects

Update to Report 11: Preparing Airport Greenhouse Gas Emissions Inventories In Reserve

The original guidebook provides essential information to airports developing greenhouse gas (GHG) emissions inventories. However there have been a number of developments in methodology and resources available since original publication and an update is needed for this publication to remain relevant/useful. This research update idea was developed as part of project ACRP 11-02/39, Environmental Products Update and is one of the priorities identified by the research team and through industry outreach.

Background (Describe the current situation or problem in the industry, and how your idea would address it.)

The original project developed a framework for identifying and quantifying specific components of airport contributions to greenhouse gas emissions (GHG). The report is designed to help airport operators and others to prepare an airport-specific inventory of greenhouse gas emissions. It includes six appendices: Appendix A-Reasons for Developing GHG Inventories, Appendix B-Emissions and Sources, Appendix C-Methods for Calculating GHG Emissions, Appendix D-Methods for Calculating CO2 Equivalencies, Appendix E-Inventory Development Protocols, and Appendix F-Approaches Used in Airport Inventories Prepared to Date.

GHG emissions management is a topic of national (and international) interest. Although air quality impacts vary by region, the topic is broadly applicable nationwide. There have been significant industry practice innovations since publication of the product. The Greenhouse Gas Protocol, upon which this guidance was based, has been updated. There is a wide body of knowledge available from airports that have developed inventories since publication. In November 2016, the legally binding international Paris Agreement climate treaty went into effect to limit global warming to 1.5 degrees Celsius by curbing GHG emissions. The Science Based Targets initiative (SBTi) was established to guide organizations in the development of emissions reductions targets required to meet the goals of the Paris Agreement. In 2014, the Airport Carbon Accreditation (ACA) program expanded to North America and currently forty-eight North American airports have achieved some level of accreditation. The Airport Carbon and Emissions Reporting Tool (ACERT) was developed by ACI to calculate airport emissions. Other examples of relevant updates since this publication include the expanding use of carbon offsets, new alternative fuels for ground fleets, updated emissions factors, expanded used of Sustainable Aviation Fuel, the release and update of various emissions modeling tools (FAA's Aviation Environmental Design Tool (AEDT), U.S. Environmental protection Agency's (EPA) Motor Vehicle Emission Simulator (MOVES), etc).

Objective (What is the desired product or result that will help the airport industry?)

Provide airports with the latest information and best practices on developing accurate greenhouse gas emissions inventories that meet accepted industry standards. The updated product should also consider new renewable energy sources, updated emissions factors, new guidance on boundary setting/scopes, protocols, industry best practices, and carbon offsets/removal. In line with industry practice, it should include increased attention on reducing emissions from mobile sources.

Cost Estimate and Backup (Provide a cost estimate and support for how you arrived at the estimate.)

Portions of the guidance are still applicable but moderate to significant text updates are needed, particularly to the Appendices A-F.

Estimated Cost to Update:

• Original project cost: $200,000 (value today adjusting for inflation is approximately $262,000)

• Estimated cost range to update: $150,000

Related Research - List related ACRP and other industry research; describe gaps (see link to Research Roadmaps above), and describe how your idea would address these gaps. This is a critical element of a synthesis topic submission.

• ACRP Synthesis 100: Airport Greenhouse Gas Reduction Efforts

• ACRP Report 56: Handbook for Considering Practical Greenhouse Gas Emission Reduction Strategies for Airports

• Airport Council International's (ACI) Guidance Manual: Airport Greenhouse Gas Emissions Management

• ACI's Airport Carbon and Emissions Reporting Tool (ACERT)

Idea No. 674