Mason, Paul Environmental footprints : how big is your travel footprint? How big is your travel footprint? - South Yarra : MacMillan, 2008 - 32 p. : col. ill. - Environmental footprints . ISBN: 9781420261516 Subjects--Topical Terms: Transportation--Environmental aspectsTravel--Environmental aspectsNature--Environmental aspectsEnvironmental degradation Dewey Class. No.: 910.4 / M398