Reduced / Sequestered
(To Implement Solution)
A century after the first commercial flight, the aviation industry has become a fixture of global transport…and of global emissions. Today, some 20,000 airplanes are in service around the world, producing at minimum 2.5 percent of annual emissions. With upwards of 50,000 planes expected to take to the skies by 2040—and take to them more often—fuel efficiency will have to rise dramatically if emissions are to be reduced.
This can be accomplished by:
- adopting the latest and most fuel-efficient aircraft
- retrofitting existing aircraft with aerodynamic winglets, better engines, and lighter interiors
- retiring older aircraft early
- operating existing aircraft with fuel-saving practices.
More dramatic redesigns of airplane bodies and sustainable jet fuels, such as those made from algae, are in development. Along with national and international regulation of the airline industry, they may help address the greenhouse gases that trail movement by flight.
This analysis focuses on adoption of the latest and most fuel-efficient aircraft; retrofitting existing aircraft with winglets, newer engines, and lighter interiors; and retiring older aircraft early. Over 30 years, and for a net cost of US$863–878 billion, 6.3–9.2 gigatons of carbon dioxide emissions can be avoided, saving US$2.5–3.6 trillion on lifetime jet-fuel and operating costs. Other efficiency measures could provide additional emissions reductions and savings as over 80 percent of aircraft are converted.
Note: August 2021 corrections appear in boldface.