by Tammy Klein (Transport Energy Strategies) … Additional efficiency improvements in planes and engines are not likely to be enough and will require lower carbon fuels also known as sustainable aviation fuels (SAF), as alternative energy vectors, such as hydrogen, will not be sufficiently developed and deployed by 2050 to significantly contribute to air transport decarbonization. There is massive potential for SAF, but there are also challenges. … So, what is it going to take to bring SAF to market? What is the tipping point? What series of events/actions have to happen to make that tipping point happen? These and the questions below were the focus of this Q&A discussion held earlier this month. Joining me for the discussion were: