The International civil aviation organisation (Icao) pledged to do more to reduce the sector's greenhouse gas emissions on Wednesday. European environmental group T&E also marked international civil aviation day by challenging industry claims of historical energy efficiency gains. Aviation organisations claim that aircraft have become 70% more efficient since the 1960s or 1970s. In fact they are no more efficient now than the last generation of propeller aircraft, and no more than 55% more efficient than the first jet aircraft, T&E said. See ICAO press release plus T&E press release and study.
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