The ecological theories and principles not only apply to plants and animals in their natural environment but also to human beings on a global scale. This offshoot of ecology i.e. the study of ecological principles and their application to the Human situation, a key for sustainable development, has been known as Environmental Sciences. This science not only deals with system concept, resources and pollution, it also encompasses human Ecology, Population and Control, Environmental Policy and Management, Environmental Law, Environmental Economics and Sustainable Development.
