Ecology is the study of the interaction between an organism and its physical environment. Human ecology specifically focuses on humans as a group of organisms and their mutual relationships within the habitat. The term ecology has its origin in two ancient Greek words: oikos (house or habitat) and logia (words or teaching). Thus, the concept of ecology has its origin the Greek oikologia, and could be rendered “teaching about the habitat.” This article explores three dimensions of ecology in order: human ecology, political ecology, and biological ecology. The central theme that unites these three subsets is how humans interact with the Earth.