For those wondering: vinasse is the crap left after you distil the fermented mass, to retrieve the alcohol. It should not be an issue, because as mentioned by the text it's a good fertiliser; however law enforcement in most of the Americas does not fucking work, and Brazil is a prime example of that - if it's cheaper to dump it into the river than to store and resell it then producers will do it, laws be damned.
Another issue (not mentioned by the text) is that long-term sugarcane farming desertifies the environment where it's grown. Yeah - it is not sustainable in the long run.
Another issue (not mentioned by the text) is that long-term sugarcane farming desertifies the environment where it's grown. Yeah - it is not sustainable in the long run.