Career question?

I have no idea what I want to major in, but I know I want to do something with animals or the environment. I am a huge animal lover, global warming activist, and vegetarian. I can't be a veterinarian, because I can't handle the surgeries, or putting animals to sleep. I already know of zoology, marine biology, and environmentalism. But what other areas are there, and what does each job do? Any information is appreciated! THANKS! :-D