yes... it is most definitely referring to the marijuana... and also, upon occassion, any substance with similar uses. too, properly, of course, it is a golfing term, but that;s really not very much fun, now is it?
A more sustainable, and more environmentally-concious way of living, eating, getting around, and standing up to the usual status quo of doing business.
When purchasing a "green" product, one is helping the earth and perhaps stopping excess Co2 emmissions from being released
also; acting in a way that is ecologically-sensitive and better for human health, also doing what is the right thing to do (if you care about the earth)