I took the MOOC: One Planet, One Ocean, and I learnt a lot about environmental issues that focus on and around the Ocean. I took the course out of sheer interest, but after having spent so much time studying, I did not mind paying the $50 to get my certificate.I am very happy about the lectures and additional material provided. It was a lot of important information that more people should know about. I like that you can also take the courses for free, if you don’t have the funds but simply want to learn something :)Great concept!