As the aviation industry comes under increasing pressure from climate-change activists to reduce its emissions, engine-maker Rolls-Royce says new approaches, including mandating use of sustainable aviation fuels (SAF), may be needed to meet environmental targets. “Fuel efficiency improvements for engines and airframes are averaging about 1-1.5% per year, so right now we are not keeping pace with reducing net CO2 emissions, so more must be done,” says Paul Stein, chief technology ...


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