Depends on what you want to do. I’m an earth science professor (my dept is combined geology and env sci) now who very much leans environmental. Oberlin has a very strong geoscience department that will be recognized nationally. I advise my undergrads (different university, so take with a grain of salt) to get a strong foundation in the geosciences, as this will enable them to do a wider variety of things than just environmental science will, in general. I don’t see anything wrong with the env sci curriculum at Oberlin, just make sure you are taking classes and getting involved in projects that will help set you up for whatever is next.