Aviation is currently responsible for 2.5% of the global CO2 emissions, but its impact on climate change rises to 3.5% when we take non-CO₂ impacts on climate into account. It is also one of the most "unfair" emissions sources, its emissions are largely driven by frequent flyers, a very small share of the world's population, while around 80% of the world population do not fly at all. The main issue is that we don’t yet have the technologies to decarbonize air travel. Electric aircraft are still not viable, apart from very small aircraft on short distances due to battery capacity limitations, and hydrogen-powered planes are also still in the concept phase. Sustainable Aviation Fuel (SAF) is a jet fuel made from sustainable feedstocks (biofuel) or from electricity and carbon (e-fuels) that can lower life cycle carbon emissions with respect to traditional fossil jet fuels. It also can work as a drop-in replacement. Yet today, it represents less than 0.05% of the world’s aviation fuel use, and scaling it massively could pose sustainability challenges. eVTOLs are not the main focus in this landscape, but you can explore them on Dealroom: eVtol startups Not all biofuel startups have been included in the landscape; you can explore all of them here.