Not to hijack this thread from the original poster, but here are the pre-req’s for the different Environmental science majors at UCD.
Most of the majors give you options for the Math and the Physics track you can take. Some major track options may require more classes due to their emphasis. The Chemistry courses are the same for all science majors. The Physics courses have two tracks: one of Bio majors and one for Engineering majors.
Biology courses are all the same for science majors.
Environmental Science and Management (6 track options):
3 quarters Biology
2-3 quarters of Chemistry
2-3 quarters of Physics
http://catalog.ucdavis.edu/programs/ESM/ESMreqt.html
Environmental Toxicology:
3 quarters Biology
6 quarters Chemistry
3 quarters Physics
http://catalog.ucdavis.edu/programs/ETX/ETXreqt.html
Environmental Policy and Planning: (7 track options)
3 quarters Biology
2-3 quarters Chemistry
2-3 quarters Physics
http://catalog.ucdavis.edu/programs/envpol/envpolreqt.html
Evolution, Ecology and Biodiversity and Wildlife, Fish and Conservation Biology:
3 quarters Biology
4 quarters Chemistry
2 quarters Physics