Understanding case laws, legal aspects, and environmental regulations in Geography optional can be a challenging task. However, there are several resources available that can help you grasp these concepts effectively. Here are some recommendations:

1. NCERT Books:
- NCERT books on Geography provide a solid foundation for understanding various geographical concepts and their legal implications.
- Class 11 and Class 12 Geography textbooks cover topics related to environmental laws, case studies, and regulations in a comprehensive manner.

2. Journals and Research Articles:
- Subscribing to academic journals like the "Journal of Environmental Law" and "Geography Review" can provide you with valuable insights into case laws and legal aspects related to environmental regulations.
- These journals often publish research articles, case studies, and analysis by experts in the field, which can enhance your understanding.

3. Government Websites:
- Government websites such as the Ministry of Environment, Forest and Climate Change (MOEFCC) and Central Pollution Control Board (CPCB) provide access to various environmental laws, regulations, and case laws.
- These websites offer resources like acts, rules, notifications, and court judgments, which can help you understand the legal aspects of environmental regulations.

4. Online Courses and Webinars:
- Online platforms like EduRev offer courses specifically designed for UPSC optional subjects, including Geography.
- These courses provide in-depth knowledge of case laws, legal aspects, and environmental regulations by experienced educators.
- Webinars conducted by subject matter experts can also be a valuable resource to gain insights into recent developments and important case laws.

5. Previous Year Question Papers and Answer Keys:
- Analyzing previous year question papers and answer keys can help you understand the type of questions asked in the UPSC examination related to case laws, legal aspects, and environmental regulations.
- This exercise will also familiarize you with the application of concepts in a practical context.

Remember, while studying these resources, it is essential to make notes, highlight key points, and revise regularly to retain the information effectively.