In its fourth edition, Ravi P. Agrahari's bestselling book is now available for the first time as complete Courseware on Environment, Agriculture and Disaster Management. It is fully updated for UPSC Prelims and Mains. The content is organised, easy to read, and includes author-curated conceptual videos, infographics, flowcharts, diagrams, mind maps, and a full-colour eBook. Pedagogical features like Do You Know, Exam Pointer, and Quick Insights help improve understanding and exam readiness. It covers basic to advanced topics and is suitable for those without a science background