Umm.. why not chemistry or biology???? But if you really want to know what the hottest area in these fields today is, it is computational biology (do a google on the phrase). To do this you need to study both a biological science and either computer programming or mathematics.
If you want to combine both of these, you could become a Biochemist like me. Best of both worlds, I've also got a lot of experience in computers and bioinformatics (sort of like computational biology), which I've found helps a lot.
Environmental Science or Environmental Engineering is also another possibility. But keep in mind that a degree is not necessarily a vocation (unless you teach at a University). A degree is your field of study. A vocation is a job. There is a difference. You really need to think about what job you want to do after graduating (admittedly that is hard, but you can research jobs for biochemists for example; they're not all the same)....that will tell you what degree you want to pursue and what elective classes you want to take.
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