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A-1Â Â Glossary of Terms 100% renewable. A condition in which renewable resources (such as wind, solar, geothermal, hydro power, and biomass) supply all airport electricity. Airport Carbon and Emissions Reporting Tool (ACERT). A method used by an airport operator to calculate their airportâs GHG emissions by source. ACRP. An industry-driven research program of the Transportation Research Board that examines problems faced by airport operators and develops near-term, practical solutions. Aviation Environmental Design Tool. Tool that models dynamic aircraft performance in space and time, demonstrating interdependencies between aircraft-related fuel burn, emissions, and noise. Carbon neutral. A condition in which airport-controlled CO2 sources and sinks are zero. Carbon negative. A condition in which airport-controlled CO2 sources and sinks are negative. Climate neutral. A condition in which airport-controlled emissions do not contribute to climate change. (Though similar to carbon neutral, this condition implies all GHGs are included). Climate positive. A condition in which an airport goes beyond achieving net-zero emissions to removing additional emissions from the atmosphere. Deep decarbonization. A condition in which airport-controlled emissions are dramatically lowered. Typically, this refers to an 80% reduction in GHGs relative to 1990 levels or 2005 levels. Intergovernmental Panel on Climate Change (IPCC). Intergovernmental body of the United Nations, tasked with researching the natural, political, and economic impacts and risks of climate change, and with developing feasible response options. Low emission. A condition in which airport-controlled emissions are low but positive. No numeric threshold has been defined for meeting this condition. Net-carbon negative. This condition is the same as climate positive. Net zero. A condition in which airport-controlled emissions are zero with use of offsets. This condition is similar to carbon neutral, but it includes all GHGs. Roadmap. A methodical plan or strategy designed to achieve a particular goal. Zero carbon. This condition is the same as carbon neutral. Zero carbon footprint. This condition is the same as carbon neutral. A P P E N D I X A
A-2 Guidebook for Developing a Zero- or Low-Emissions Roadmap at Airports Zero carbon growth. A condition in which airport-controlled CO2 emissions do not grow larger each year. Zero emissions. A condition in which airport-controlled emissions are zero without the use of offsets. This condition can only be met when all end uses are electrified or use zero or negative emissions synthetic fuels.
