In the Environmental Studies section of the UPSC syllabus, candidates should cover topics such as biodiversity, climate change, waste management, and sustainable development. Understanding the ecosystem, pollution control measures, and conservation efforts is crucial. Additionally, candidates should familiarize themselves with national environmental policies, international treaties, and their implications. Issues surrounding renewable energy sources and the impact of human activities on the environment are essential topics. Integrating these aspects provides candidates with a holistic view, essential for tackling related questions in the examination.