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12 CHAPTER 2 Inventory Development Considerations This chapter provides all of the protocol considerations cussed in Section 1.4, the following four categories are rea- to develop an airport GHG emissions inventory. Each sec- sons for developing an airport GHG inventory: tion in this chapter serves to provide guidance on specific aspects of an inventory (e.g., source categorizations, geo- 1. Climate change initiatives--GHG reduction goals, graphic boundaries, etc.). They essentially provide instruc- 2. Environmental management and sustainability programs, tions on how to set-up an inventory. In contrast, Chapter 3 3. Disclosure of project/action effects, and provides all of the calculation methods to complete the in- 4. Future regulations. ventory. An overview of the procedure is shown in Figure 2-1 and is reflected in the ensuing sections. For the first category (climate change initiatives--GHG The steps in Figure 2-1 are shown serially in an attempt to reduction goals), all sources that generate GHGs and are used methodically explain the process. However, it is expected that or operated at the airport, including those owned by the air- these steps may be followed in parallel under many cases to port operator (e.g., infrastructure items), as well as those that allow more efficient development of an inventory. As invento- are influenced by the airport (e.g., aircraft) should be included ries are being prepared due to local influences, each airport in the inventory. This allows a comprehensive accounting of operator should determine the best use of this guidance mate- all sources, which is typically desired in a climate action plan. rial based on their project needs and the data available. The inventory can be used to identify major sources and track the emissions of these sources over time. As a result, all of the sources listed later in Chapter 3 would ideally be included in Although this Guidebook provides instructions on an inventory developed for this reason. developing a GHG inventory, each airport opera- The next two categories (environmental management tor should determine the most efficient use of the and sustainability programs and disclosure of project/action information based on their own needs and data. effects) represent subsets of the climate action initiatives in terms of source coverage. In these two categories, only the affected sources are included in the inventory since the pur- In large part, this chapter is based on the background infor- pose is to monitor changes in GHG emissions associated with mation provided in Appendix E. As such, that appendix should a project or action. For example, in a state NEPA-like inven- be reviewed for any additional information or clarifications on tory, such as the previous example of a runway extension, the guidance provided herein. only the sources affected by the extension are included in the inventory. These could include construction equipment to build the extension, aircraft ground movement, and energy 2.1 Purpose of the Inventory for runway lighting. For a sustainability project involving fuel The first step in the inventory development procedure is to conservation, just the airport infrastructure energy use (possi- determine the purpose of the inventory. This will aid in defin- bly electricity use) could be assessed depending on the specifics ing the breadth of sources to be considered. It is the respon- of the project. Often, the goals of such projects are to show sibility of the inventory developers to make sure they under- differences in emissions caused by the projects. That is, the stand the purpose for generating inventories such that they goals are to determine the differences between action (build) will know which sources to include in the inventory. As dis- and no-action (no-build) cases to show the adverse or bene-