But he warned that the industry does not yet know for certain the length of sewers being taken on or what condition they are in, so estimating costs is difficult.

BBC: Water companies told to deal with private sewers

Some say that data-center landlords aren't taking into account increasing technological advances when estimating these costs.

WSJ: Data-Center REITs Lose Favor

Nobody really knows because, save for the leap in petrol prices during the 1970s oil crises, there is little basis for estimating to what extent higher marginal costs reduce driving.

ECONOMIST: A survey of commuting