21.01.2021 How will we achieve carbon-neutral flight in future? Carbon-neutral aviation is possible, but in future, aircraft are likely to continue to be powered by fossil fuels. The CO 2 they emit must be systematically stored underground. This is the most economical of various approaches that ETH researchers have compared in detail. It is politically agreed and necessary for climate protection reasons that our entire economy becomes climate-neutral in the coming decades – and that applies to air travel, too. This is a technically feasible goal, and there are numerous ways to achieve it. ETH Professor Marco Mazzotti and his team have now compared the options that appear to be the easiest to implement in the short and medium term and evaluated them according to factors such as cost-effectiveness.