Airplanes

http://www.latimes.com/local/la-me-0529-lax-pollution-20140529-story.html http://blogs.stlawu.edu/mackenzieholland/airplane-pollution/ http://enva-109.wiki.usfca.edu/file/view/intercity_rail-02-1.jpg/420875850/intercity_rail-02-1.jpg http://www.emagazine.com/earth-talk-archive/airplane-pollution-reusing-shoes-and-biomass-energy http://www.flyingclean.com/about_us http://www.conserve-energy-future.com/causes-effects-solutions-of-air-pollution.php