1. Article from European Commission, EUROSTAT.
http://epp.eurostat.ec.europa.eu/statistics_explained/index.php/Transport_energy_consumption_and_emissions
2. Article on “Environmental Case Study—Automotive”, by World Steel Association.
https://www.steel.org/~/media/Files/SRI/Media%20Center/AutomotiveCaseStudy.pdf?la=en
3. Article on Green House Gases by Environmental Protection Agency (EPA).
http://www.epa.gov/climatechange/ghgemissions/gases/co2.html
4. Article on “Trends in Global CO2 Emissions 2016 Report” by PBL Netherlands Environmental Assessment Agency
5. Belhabib, M.: Introduction to lightweight vehicles. In: Workshop on “Metallic Materials for Automobile of the Future”, Pôle d’Ingénierie des Matériaux de Wallonie in Liege, Belgium (2011)