I take this to mean some sort of community or city infrastructure which acts as a shared resource to drive down costs for all users - like centralized heat and power generation, or community wind-farms.

Attempts to build green infrastructure require a legislative and regulatory model that both allows and supports the required infrastructural changes. This is most important at the level of municipal government and local communities.

This may mean mechanisms to fast-track certain kinds of regulations, permitting procedures, and standards.

It might even be helpful to have some sort of omnibus "green exemption" for buildings and infrastructure which either meet a set of criteria or which attempt to create new solutions.

Criteria to measure the level of sustainability achieved by an infrastructural change should point to solutions, not particular ways of achieving solutions.

A possible definition of a green infrastructural change is a change that uses resources sustainably, minimizes/reduces the environmental impact without greatly affecting the use of technologies by end users.

Please explain what "green" infrastructure means.