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[LE BOURGET, France] It was a love-in between ministers and industry execs as the Paris Air Show focused on environmental issues on Thursday, but it capped a week of lower sales for big hitters Airbus and Boeing.
A mini-conference on the air industry's contribution to tackling climate change at the world's premier air show saw much mutual back-slapping between government ministers, climate scientists and industry honchos - who all share an interest in reducing emissions.
The aerospace sector has made huge strides in energy efficiency in recent decades - not least because rising fuel prices have created big financial incentives for cleaner technology.
"For aviation, 'business as usual' is improving energy efficiency," said Tony Tyler, head of the International Air Transport Association.
"Those of you who arrived by air, your flights produced half the CO2 per kilometre than they would have done in 1990."
The venue at Le Bourget just outside Paris will also play host to climate talks later this year aimed at setting a global cap on greenhouse gas emissions.
The air industry is not waiting to be told - it has set its own targets of halving emissions again by 2050 and putting its own carbon-trading system in place by 2020.
All this has helped spur huge investments and innovations in aerospace - manna from heaven for French politicians looking to boost both their green credentials and the struggling economy.
"Ecology is not opposed to growth - quite the contrary," said Environment Minister Segolene Royal, happily noting that her constituency is helping develop Airbus's new all-electric E-Fan plane.
Little wonder that the big sellers at this year's air show have been planes promising big fuel savings - led by Boeing's 737 MAX and the Airbus A320neo, which offer some 15 to 20 percent in energy savings on previous models.
But the sales war between two companies that dominate the industry was somewhat tamer than previous years.
Boeing confirmed 145 orders worth US$18.6 billion, beating Airbus with 124 orders totalling US$16.3 billion.
That was a long way off the record sums of US$39.3 billion for Airbus and US$38 billion for Boeing achieved at the last edition in 2013.
But the industry is hardly struggling - both companies' order books are full into the next decade and predict a demand of more than 30,000 planes over the coming 20 years as air traffic doubles to over 7 billion passengers per year.
Airbus also said it had lined up nearly 300 more orders at the show that it expected to confirm soon, while Boeing says it has another 186 orders in the pipeline.
"I believe that 95 per cent, if not 100 per cent will translate into firm orders," said Airbus boss Fabrice Bregier.
Still, there has been a slowdown compared to the massive buying spree of recent years.
"With order books full for six to eight years, the record years when companies would get two years' worth of orders each year are behind us," said Massi Begous, an expert at consultancy Roland Berger.
The slowdown was also evident from a reduced presence at this year's show.
There were fewer planes on display, down to 100 from 150 in 2013, while several big manufacturers chose to stay away, including Sweden's Saab, UK-based BAE Systems, and the US Northrup Grumman group.
Paris is the oldest and biggest air show in the world, having first taken place in 1909.
It opens its doors to the public from Friday, when they will get the chance to see some 40 aircraft in flying displays each day, including fighter jets such as Pakistan's JF-17, France's Rafale and Ukraine's Antonov 178.