Generally speaking the emissions that are associated with building plants tend to be a very small portion of what ends up being the total life cycle. They are not usually included in most life-cycle analyses because we run into questions like over how long a period of time we should amortize these construction emissions. Should we do that in 20 years, which is what we do for tax purposes, knowing that the plants will last a lot longer?
Given the fact that they're small and that no one can agree on the amortization period, they're generally not included and they don't impact the conclusion that we should be doing as much today as we possibly can.