I totally get where you're coming from. When I was working on mine, I felt the same way. It's crucial to choose a topic you're passionate about. As for resources, I found it helpful to check out samples of successful capstone projects and to seek expert advice. That way, you get a sense of direction and can avoid common pitfalls. Don't hesitate to reach out to professionals or experienced peers!

For environmental sustainability, there's indeed a plethora of topics! I started by pinpointing a specific area I felt strongly about. After that, I made an outline. It's also worth noting that I did seek professional guidance. They me immensely, from refining the topic to ensuring that my research was thorough and well-presented. It might be a good idea for you to do the same!