With efficiency gains from airframe and engine technology improvements considered insufficient to meet the International Air Transport Association’s (IATA's) 2050 emissions-reduction target, the only conceivable way to do so is through the widespread use of biofuels. But concerns over the speed at which sustainable aviation fuels can be certified and supplies sufficiently produced leave a question mark over whether the industry will be able halve its carbon-dioxide (CO2) emissions ...

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