Direct GHG Emission Categorization

GHG emissions are aggregated to help identify sources and ensure consistency in reporting GHG inventories. Each category can be subdivided depending on the intended user or other factors.

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Category 1: Direct GHG emissions and removals

Direct greenhouse gas (GHG) emissions and removals occur from GHG sources or sinks that are inside an organization's boundaries and owned or controlled by the organization. These sources can be stationary, such as heaters, electricity generators, and industrial processes, or mobile, such as vehicles. Stationary combustion results in direct emissions from the combustion of any type of fuel burnt in stationary equipment like heaters, gas turbines, and boilers, while mobile combustion results from fuel burnt in transport equipment like motor vehicles, trucks, ships, and aircraft. Industrial processes such as cement and lime production, chemical production, manufacturing, oil and gas refining, and non-combustion processes also produce direct process emissions. Direct fugitive emissions can come from systems that extract, process, store, and deliver fossil fuels, equipment leaks, agricultural processes, and uncontrolled decomposition of waste material. Direct emissions and removals from land use, land use change, and forestry (LULUCF) cover all GHGs from living biomass to organic matter in soils. IPCC guidelines assess emissions in six main land-use categories and several carbon reservoirs.

Source: Greenhouse gases — Part 1: Specification with guidance at the organization level for quantification and reporting of greenhouse gas emissions and removals

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