Environmental Studies requires two Mathematics Courses
The following are recommended as your first course.
 
Math 167,  Precalculus Recommended as the first mathematics for incoming students not ready for calculus.
Math 191,  Calculus I Required for students interested in Polution Control,  and recommended to students planning graduate studies.
Stat 185,  Intro Statistics Alternative second choice.

If you choose Calculus your next step is to check if you are ready for the class.