  Life Cycle Assessment (LCA) of green and sustainable projects has been found
to be a necessary analysis in order to include all upstream, downstream, and
indirect impacts. Because of the complexity of interactions, the differential
impacts with respect to a baseline, i.e., a business-as-usual (BAU) scenario,
are commonly considered to relatively compare various projects. However, as the
degree of penetration of a project in the baseline increases, the popular
marginal assumption does no longer hold, and the differential impacts may
become inconsistent. Although various mythologies have been successfully
proposed and used to contain such a side effect, the bottom-up nature, which
initiates the assessment from the project itself and ultimately widens the
scope, could easily fail to acknowledge critical modifications to the baseline.
This is highly relevant in terms of ICT's disruptive and dynamic technologies
which push the baseline to become a marginal legacy. In this work, an analytic
formalism is presented to provide a means of comparison of such technologies
and projects. The core idea behind the proposed methodology is a
magnitude-insensitive graph-based distance function to differentially compare a
project with a baseline. The applicability of the proposed methodology is then
evaluated in a use case of OTT/IPTV online media distribution services.
