9 | Passenger transport modal shares of several cities in developing countries. Source: based on WBCSD, 2009 . 

... About 40% of all transport emissions occur in urban areas (I.E. Agency, 2008), and 58 therefore CO 2 reduction efforts increasingly focus on this mitigation potential (Kahn Ribeiro et al., 2012; Sims et al., 2014). 59 ...