In Elon Musk's recent Reddit AMA (ask me anything), he talked about
Initially, glass panes with carbon fiber frames
For colonization of Mars.
My question: Does a glass roof provide sufficient protection for plants/humans [against radiation] to create edible food on Mars?
Extra credit: Is ISRU glass production possible with minimal manufacturing capabilities? Or is spaceX forced to transport the glass? (Isn't glass heavy, and non-maleable making it difficult to transport?)