The airline industry needs more efficient engines, cleaner fuels and new ways of offsetting the impact of fuel consumption on the atmosphere,International Air Transport Association (IATA) director-general Pierre Jeanniot said. If limits on future airline capacity on environmental grounds are to be avoided, there must be a broader debate on concerted action - by regulators, airports, manufacturers and fuel suppliers, he told IATA's Fuel Trade Forum meeting in Dubai on Wednesday The forum groups airlines, fuel suppliers as well as aircraft and engine manufacturers.