This document provides an overview of environmental studies as an interdisciplinary field. It defines key terms like environment, biotic and abiotic factors. It describes the four spheres of the environment - atmosphere, hydrosphere, lithosphere and biosphere. It discusses the interaction between living organisms and their surrounding environment. It also outlines the positive and negative impacts of human activities and technology on the environment. The document emphasizes that environmental studies considers both scientific and social aspects to develop a holistic understanding of environmental issues.