Knowra Aviation emissions Aviation emissions Aviation emissions are pollutants and greenhouse gases released by aircraft operations and related activities, including fuel production, airport operations, and aircraft manufacturing.
Jet engine : An engine that produces thrust by accelerating a high-speed exhaust stream, commonly using a gas turbine. Combustion in jet engines releases carbon dioxide, nitrogen oxides, water vapor, and soot.
Carbon dioxide emissions : Releases of carbon dioxide into the atmosphere, especially from fossil-fuel combustion and industrial processes. Burning aviation fuel produces carbon dioxide that accumulates and contributes to long-term warming.
Aircraft electrification : The use of electric propulsion and electrical energy storage to power aircraft. Electric aircraft can avoid in-flight combustion emissions, but battery mass limits their range and capacity.
Global warming potential : A metric comparing the heat trapped by a greenhouse gas over a specified period with that of carbon dioxide. It helps compare aviation gases, but cannot fully represent short-lived contrail and cloud effects.
Aircraft contrails : Linear clouds formed when aircraft exhaust water vapor condenses and freezes in cold, humid air. Persistent contrails can spread into cirrus clouds that trap outgoing heat.
Carbon offsetting : Compensating for greenhouse gas emissions by funding reductions or removals elsewhere. Airlines and passengers have used offsets to address flight emissions, though their climate value varies.
Hydrogen aircraft : Aircraft designed to use hydrogen as an energy carrier, through combustion or fuel cells. Hydrogen can eliminate in-flight carbon dioxide emissions, but production and non-CO₂ effects remain relevant.
Climate change : Long-term shifts in temperatures and weather patterns, driven largely by human greenhouse gas emissions. Aviation contributes to climate change through carbon dioxide and several non-carbon-dioxide effects.
Nitrogen oxides : A group of reactive gases, chiefly nitric oxide and nitrogen dioxide, formed during high-temperature combustion. Aircraft nitrogen oxides affect ozone and methane concentrations, with effects that vary by altitude and time.
Carbon pricing : Policies that assign a monetary cost to greenhouse gas emissions through taxes or tradable permits. Putting a price on aviation carbon can change airline costs and incentives to cut fuel use.
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