The future of flying might depend on french fries, trash, and sunlight. Aviation accounts for about 2% of global carbon dioxide emissions, and once you add in other polluting gases, the industry is responsible for about 3% of all human-caused global warming. One way the aviation industry hopes to cut down on its climate impacts is by using new fuels. These alternatives, often called sustainable aviation fuels (SAFs), are made from a wide range of sources and can largely be used by existing planes. They could be the key to helping this sector meet its climate target: net-zero carbon dioxide emissions by 2050. New ... (full story)