According to the International Air Transport Association (IATA), in 2014 air transport produced 715 million tons of CO2 (689 in 2012), about 2% of climate-change gases. Not a negligible share. Therefore, faced with increasing pressure to reduce emissions, airlines are battening down the hatches. So much so, that IATA has set the objective of zero emission increase by 2020 and a reduction of 50% (compared to 2005 emissions) by 2050. Although changes in routes and take-off and landing procedures can help cutting fuel consumption, as well as more efficient engines, the main reduction should come from using less polluting fuels. Especially biofuels, in particular next generation ones. Examples are plentiful. As early as 2008, Virgin used biofuel (20% blend) derived from co...