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"By now it is pretty well known, at least within the TreeHugger community, that there are issues with aviation and climate change. While the exact contribution that flying makes to the climate crisis remains the subject of fierce debate, it seems"^^<http://www.w3.org/2001/XMLSchema#string>
<http://www.treehugger.com/aviation/pack-less-fly-direct-stick-with-economy-greener-flying-tips-from-terrapass.html>