Myong (2018) Green Infrastructure Financing: Institutional Investors, PPPs and Bankable Projects, Palgrave Macmillan. (12/2012 223 (3. . 11 To complement something, means to bring to perfection or complete. This includes roads, highways, bridges, airports, water distribution networks, sewer systems, irrigation plants, etc. 21 Sources of funding edit The source of financing varies significantly across sectors.