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<p>The Department does not quantify the non-CO<sub>2</sub> impacts of aviation because
of the extent of the scientific uncertainty in this area. Whilst there are a number
of emission types from air travel, other than CO<sub>2 </sub>that are known to have
an impact on global warming, the magnitude of these impacts is not well known. This
approach is consistent with the Committee on Climate Change’s recent advice that acknowledges
the difficulties in measuring and reporting the impact of non-CO<sub>2</sub> emissions.</p><p><strong>
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