1. Availablea : https://sustainabledevelopment.un.org/.
2. Availableb : http://www.investopedia.com/terms/s/sharing-economy.asp.
3. Availablec : https://en.wikipedia.org/wiki/Internet_of_Things.
4. Availabled : http://ec.europa.eu/environment/gpp/index_en.htm.
5. Availablee : http://www.nist.gov/nanotechnology_s.cfm.