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An airplane round trip per person between London & Los Angeles could mean an equivalent energy of about 10,000 kWh per person – about the same as having a 1 Ton AC on 24x365 days!
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Almost 95% of all emissions from an aircraft's business value chain will come from the use of fuel during the aircraft's operation, with its manufacturing contributing to just 5%.
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NASA has demonstrated a way to build "hybrid wing” airplanes that dramatically reduce fuel consumption.The Blended Wing Body (BWB) design, combined with the super-efficient ultra-high bypass ratio engine, could use half as much fuel as conventional aircraft.
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Target True Zero has identified three potential alternative propulsion technologies as having the greatest potential to reduce aviation’s climate impact; electrification using either batteries or hydrogen fuel cells and hydrogen combustion using gas turbines.
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https://www3.weforum.org/docs/WEF_Target_True_Zero_Aviation_ROUND_2022.pdf