This document provides an introduction and overview for a textbook on Environmental Studies for Class III. It discusses the challenges in developing a national-level textbook that addresses diverse students across India. It emphasizes integrating topics rather than separating them into distinct subjects. It also stresses the importance of reflecting India's multicultural diversity and making all students feel represented. The introduction explains that the textbook aims to encourage active learning over passive reception of information. It provides guidance for teachers on using the textbook and evaluating students in a continuous and comprehensive manner.