Scenario:

A newly discovered pollutant is greatly damaging both air and water quality in central Indiana, leading to the illnesses of thousands of people. Your government colleagues figure out that the pollution amount would need to decrease by 50% in order to get to safe breathing and drinking levels. Your colleagues also determine that only five companies are entirely responsible for the emission of this pollutant, and they are all polluting equal amounts.

What do you advise the government to do? Why do you take this course of action?