Take the following as truth: It has been a resounding success, with SO2 emissions from power generation dropping 4.5 million tons from 1990 levels and NOx emissions down 1.5 million tons from 1990 levels (about 3 million tons lower than projected growth).
Then the following statement: "Regulations governing emissions from power generating plants have caused successful drops in power plant emissions." is true, false, or inconclusive?
Answer: Inconclusive