Curious to see some data on these claims. Yes, glue is often made out of "chemicals" — but plastic also is. Is the total environmental cost of plastic lower than wood? Besides, you're not going to frame a house with plastic: it's steel and concrete, vs wood. AFAIK plastic doesn't enter the equation here.
We ready use plastic in decks. I bet it can be further scaled up. At what cost I have no idea though. But I wouldn't count it out as a primary building material
