The finite availability of fossil fuels and environmental pressures drives students in the field of renewable energy to discover and implement new technologies to harness the power of the wind, sun, and water, as well as geothermal and bioenergy options.

Education in the United States is mainly provided by the public sector, with control and funding coming from three levels: state, local, and federal, in that order. The common requirements to study at a higher education level in United States will include your admissions essay (also known as the statement of purpose or personal statement), transcript of records, recommendation/reference letters, language tests

A PhD is a highly advanced degree that helps graduates become experts within a field. Earning this degree may help students be better qualified for their chosen careers as well as any other professional pursuits they may have.

Part-time learning allows one to obtain a degree or qualification even if one cannot attend school on a full-time basis. One can learn at one's own pace, gradually accumulating credits that count towards a final qualification.