<p>Which major do you think will lead to more job opportunities?</p>
<p>Geology is probably better. It has been around a while and is considered a legitimate natural science and well established profession rather than being seen as a fad major like Environmental Science might be. When you tell prospective employers, presumably people that hire geologists like oil companies, that you majored in Geology they have a pretty good idea of what you studied and what you know and how it will fit into their organization. If you say you majored in Environmental Studies most people are not going to have a very clear idea of just what you studied and what knowledge and skill you will bring to the job that will be of value to an employer.</p>