国际航空运输协会在哥本哈根会议期间公布了航空业的减排目标，承诺到2050年，该行业的碳排量将比2005年减少50％。航空公司、机场、空中航行服务供应商和制造商等协会成员均承诺：到2020年，年均燃效提高1.5%；从2020年开始，稳定碳排放，达到碳中和增长；到2050年，碳排放量将比2005年减少50%。根据这项目标计划，从现在起到2020年，航空业的二氧化碳净排量将达到一个峰值，之后将会趋于稳定并逐渐呈下降趋势，并且该趋势不受航空运输量增加的影响。这一目标的提出将督促航空企业更多地考虑使用绿色技术和可替代能源，同时也促使航空运输行业采取一定的经济手段来激励为减排做出贡献的企业。

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The world aviation industry yesterday announced a long-term goal to cut carbon dioxide emissions to half the 2005 levels by 2050, becoming the first industry to articulate a reduction goal at the Copenhagen climate change conference.

The world aviation industry航空工业 yesterday announced a long-term goal to cut carbon dioxide emissions to half the 2005 levels by 2050, becoming the first industry to articulate明确有力地表达 a reduction goal at the Copenhagen climate change conference.

The agreement, reached between 230 airlines in the International Air Transport Association (IATA), aircraft manufacturers, air traffic control providers and airports, sets a series of targets for the industry:

* Improve fuel efficiency on average by 1.5 percent per year until 2020;

* Stabilize稳定，安定 emissions with carbon-neutral growth from 2020;

* Cut emissions in half by 2050, compared to 2005 levels.

Under this plan, net carbon dioxide emissions from aviation would peak between now and 2020 and would stabilize³ and then decline after that, despite increases in traffic growth.

However, final decisions on how to achieve the ambitious goal will be made in September 2010.

"We're the only industry coming to Copenhagen with a clear and ambitious有雄心的 reduction goal," said Giovanni Bisignani, director general and CEO of IATA.

The proposal would increase airfares飞机票价 and could prompt a race for green technologies among aircraft makers⁴, which are pinning high hopes on new technologies for reducing emissions. The development of sustainable可以忍受的 alternative jet fuels, such as those generated from algae海藻, could help reduce emissions by 80 percent, said Bisignani. Other technologies, such as improving aircraft efficiency with lightweight materials and new engine designs, could all result in further cuts.

In addition, the industry will need to engage in economic measures to create successful incentive⁶动机，刺激 for airlines to reduce emissions, such as emission¹ trading. "Airlines must be fully⁷ accountable for their emissions as an industrial sector⁸, not by state or region," Bisignani said, adding free riders搭便车者，免费使用者 are not welcomed.

Aviation executives are trying to ensure that the industry is not stripped of剥夺 its exemption免除，免税 from the Kyoto Protocol¹⁰ in Copenhagen. Despite the fact that the major airlines are trying to cut emissions from air travel, executives fear a failure in the international effort to agree a global deal on emissions trading, arguing that it could hurt the industry by way of increased taxes and regulation.

The last time global targets were agreed for reducing greenhouse gases was at the 1997 conference in Kyoto, but the airline industry was not included. In the years since, scientific evidence has supported growing concerns that carbon emissions caused by flying are a real problem. Airlines are responsible for 2 to 3 per cent of carbon emissions globally.