Take the following as truth: It would take 2-3 years to add a plant; and this would only be done after a regulation was put in place, the technical advantages of ACI for mercury removal were proven relative to other approaches, and a clear time-line for compliance was mandated.
Then the following statement: "The last plant added took about 2 and a half years." is true, false, or inconclusive?
Answer: Inconclusive