Hill Heat: Aviation and the Environment: EmissionsScience Policy Legislation Actiontag:www.hillheat.com,2005:TypoTypo2008-05-06T14:01:21-04:00Brad Johnsonurn:uuid:ee92ccec-890f-42d7-9478-c22d657a33212008-05-06T14:00:00-04:002008-05-06T14:01:21-04:00Aviation and the Environment: Emissions