Professor Klotz is a really nice guy that genuinely cares about students and their thoughts on sustainability. Most classes involve discussion, and before class, there's usually just a short reading/activity that you have to write a post about. Each class covers a different topic about sustainability, and overall is well structured, even though discussions can sometimes get carried away. There's no final or tests but there are a few group projects where you design a new system and analyze the sustainability of the system. Definitely recommend this class even if it's not related to your major.