Aspirants should focus on key environmental concepts while preparing for environment-related questions in UPSC, such as climate change, biodiversity, and sustainable development. Understanding international agreements like the Paris Agreement and India's commitments under various environmental protocols is critical. Additionally, candidates should be aware of pressing issues like air quality, water management, and waste management in urban areas. Incorporating current affairs related to environmental policies can help candidates develop a comprehensive perspective, essential for addressing these topics during the examination.