Plans to reduce airline CO2 emissions using jet fuels made from waste wood have been called a " big dream " by environmentalists who have accused the industry , especially in the US , of not meeting meaningful standards , despite a goal set by the International aviation Aviation Authority to cut aviation emissions to half of 2005 levels by 2050 . Critics say that around 170 large scale bio - fuels would need to be closed every year between 2020 and 2050 , costing a prohibitive $ 60bn a year . At $ 3 per gallon , the green fuel would be more than double the current market price of petroleum - based jet fuel .
Plans to reduce airline CO2 emissions using jet fuels made from waste wood have been called a "pipe dream" by environmentalists who have accused the industry, especially in the US, of not adopting meaningful standards, despite a goal set by the International Civil Aviation Authority to cut aviation emissions to half of 2005 levels by 2050. Critics say that around 170 large scale bio-refineries would need to be built every year between 2020 and 2050, costing a prohibitive $60bn a year. At $3 per gallon, the green fuel would be more than double the current market price of petroleum-based jet fuel.