$23-3.$ Business Case Problem with Sample Answer$-$

Agency Powers. A well$-$documented rise in global tem$-$

peratures has coincided with a significant increase in the

concentration of carbon dioxide in the atmosphere. Many

scientists believe that the two trends are related, because when

carbon dioxide is released into the atmosphere, it produces a

greenhouse effect, trapping solar heat. Under the Clean Air

Act $($CAA$),$ the Environmental Protection Agency $($EPA$)$ is

authorized to regulate "any" air pollutants "emitted into $...$

the ambient air" that in its "judgment cause, or contribute to$,$

air pollution."

A group of private organizations asked the EPA to regu$-$

late carbon dioxide and other "greenhouse gas" emissions

from new motor vehicles. The EPA refused, stating, among

other things, that the most recent congressional amendments