The other aspect of the US position that has drawn cries of "hypocrite" from the environmental community is that it asks the EU to stand down its ETS plan and instead develop a truly global measure to tackle aviation emissions.

BBC: US and its airlines: Too much hot air?

None of the research groups that have worked on developing these models has felt that it was important to include the much weaker effect of exposure to ETS, even though a number of them have assessed this association.

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