
The aviation industry is to pledge to cut carbon dioxide emissions to half the 2005 levels by 2050, the head of BA will tell world leaders later.
British Airways Chief Executive Willie Walsh will say the industry's proposals are "the best option for the planet".
The move would force air fares up and could prompt a race for green technologies among aircraft makers.
The deal between airlines, airports and aircraft companies will be presented at the UN's climate summit in New York.
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