Authorship is usually collective, but principal authors are named. In the case of passenger transportation, this will involve extending public transport services, particularly in the suburbs, and making the existing network more efficient. Major projects are underway to expand the system, but much less is being done to green to freight transport. Green transportation infrastructure projects are a key focal point of the Grenelle exercise as well as the Greater Paris plan. As in the case of the building sector, the financing needs are considerable, amounting to nearly EUR 32.4 billion over 2010-2025, of which EUR 23.8 billion has been secured. A further missing element is an integrated approach on the part of operators, who instead tend to work in isolation.