Efficiency gains through new technology will not be enough. Air travel must be included in any post-Kyoto framework so that the balance of costs is tipped towards rail and against air.
纵然新的科技能够提高效率，航空旅行必须尽快被纳入“后京都框架”，以使铁路来分担更多的运营成本。
We can imagine that if one decides to propose a new framework, it would be difficult to predict how long a consensus could be reached then, let alone to achieve a post-Kyoto agreement.
试想，如果撇开业已达成的基础另起炉灶，短期内就该谈判基础本身都恐难形成共识，更别提要就后京都安排达成协议了。
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