The online review discussion is posted in the comments section of Hima's post below.
Last week we discussed the Ma. v. EPA (pdf) Supreme Court decision. In that case the court ruled that Congress in passing the Clean Air Act ordered the EPA to regulate air pollution caused by new car emissions. So, unless the EPA could demonstrate scientifically that emissions were not air pollution it had to regulate - it had no choice. Consider this case in light of our discussion of delegating legislative authority (Mistretta) and in light of the MS v. Johnson case. See this NYT article on the case.