Can I change my major before starting Junior year even if it puts me back?

<p>I'm transferring in (to UCSC) this year as a Junior. I've been set up for the psychology major and have completed nearly all the prereqs. Now I'm considering switching to environmental studies/biology OR neuroscience and behavior (biological sciences department). Basically, I just don't think a major in psych is right for me. However, I am into the biopsychological aspect of it, just not counseling/treament. Hence, my interest in neuroscience. Also, the environment is a main concern of mine so I feel I could fit with the envr/bio major.</p>

<p>I'm aware this course of action would me way back as I would have to complete several prereqs. Is this a wise course of action and how many extra years would it take to acquire my bachelor's in either of the above majors?</p>