http://www.motivators.com/Promotional-EcoFriendlyIceScrapers-Custom-38-742.html(eco-friendly ice scrapers)
http://www.ecoincentives.com/ (eco-friendly advertising materials)
http://www.ecopromotionsonline.com/ (eco-friendly advertising materials)
http://www.un.org/en/globalissues/climatechange/index.shtml
http://www.footprintrechner.at/footprint/question/verkehr (German calculator for co2-footprint)
http://www.ft.com/cms/s/2/9d092c98-4184-11e1-8c33-00144feab49a.html#axzz1rpgBXr3p