No clear scientific solutions currently to the emissions caused by flying, scientists conclude.
You may be hoping that guilt-free flying is just around the corner, but scientists warn it is still a long way off.
Switching to sustainable fuel is also key to the government's aim to reach "jet zero" flying by 2050.Flying is responsible for 2.4% of global greenhouse gas emissions and. These gases warm the atmosphere, contributing to global warming and climate change. The authors of the Royal Society report looked at four options for greener fuels to replace the 12.3m tonnes of jet fuel used annually in the UK.Some airlines now use very small amounts of biofuel, largely made from crops. London Heathrow is the largest global user of biofuels but it accounts for just 0.5% of the airport's fuel.
Another option is fuel made from hydrogen produced with green electricity. However the UK currently does not generate enough renewable electricity to make enough green hydrogen.Ammonia and synthetic fuels are also under consideration, but they need even more green hydrogen and it is unclear if existing planes could use them.
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