The commercial aviation industry emits 705 million metric tons of carbon dioxide each year. While that represents only about 2% of global carbon emissions, there is evidence that the greenhouse gases in jet fuel have a larger effect on the atmosphere because they are released at high altitude. Efforts to introduce biofuels to power jet engines have so far fallen short of their targets, and many in the industry believe the pathway to cleaner jets is through advances in engine technology rather than cleaner fuels.
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