PhD or Doctor of Philosophy is a postgraduate degree awarded by universities that usually lasts from three up to five years. Graduates with a Doctorate of philosophy 's degree are automatically awarded the academic title of doctor. PHD programs can focus on philosophy but also theology, law, medicine and liberal arts as well. Boys and girls interested in a career as teacher or lecturer tipically decide to start these paths since professors are increasingly being required to have a PhD.
Master programs and postgraduate courses in ecology for graduates with bachelor's or master's degree and young professionals offer a specialization on topics related to nature, flora, fauna but also populations, communities, ecosystems, landscape. Boys and girls choose to become students of these programs to gain targeted skills related to the protection of territories and biodiversity rather than the exploitation and optimum use of available natural resources, including in terms of possible economies and eco friendly and sustainable business such as renewable energy sources and alternatives.