The assertion and interpretation of "immaturity" on issues like this holds us all back. Perpetuating a known problem hardly seems "mature" or even "sane".
I appreciate that doing things differently demands extraordinary cultural and economic shifts, new business models, faith... I don't see any of that as immature.
We learned to harness ox and horses for this reason. These things don't pollute as much as a truck, and at the end of their lives we can eat them or they can become food for our ecosystem peers rather than leave them in toxic dumps.
I'll rephrase my point to highlight what I think most relevant: if we constantly make concessions towards cost efficiency (because it's "pragmatic" and "mature") we will run out of time to deal with the major pollution problem before it kills us and most of our peers.
I don't think it's as clear cut as that. Farming and keeping animals consumes a lot of natural resources. Keep in mind that you'd need a lot of time and a lot of oxen or horses to haul two tons of material.
I appreciate that doing things differently demands extraordinary cultural and economic shifts, new business models, faith... I don't see any of that as immature.
(Perhaps I'm immature :) )