The world needs a new source of energy, an unspillable source.

what college major is good for studying global warming and energy conservation in engineering?

Im really interested in trying to make renewable energy, helping with global warming, and trying to conserve energy. I really like topics like solar panels, “go green”, etc. I saw a major that was energy engineering and that was perfect, but just at one college. what other majors are like that? please help!