An
analysis of the ACP's climate change impact and that of the Mountain Valley Pipeline, conducted for the Sierra Club by physicist Richard Ball, showed that building these two
pipelines would result in the emissions of twice the climate pollution of Virginia's entire
current greenhouse gas footprint.
Ray Perryman, the economist hired by TransCanada to assess the economic benefits of the
pipeline, told me that his
analysis — the methodology of which has been questioned — points to an impact of «around 3.5 - 4 cents per gallon of gasoline at
current prices» once the
pipeline «was fully implemented and flowing reasonably close to capacity.»