Two thoughts
1) have you ever read Jesus'
Sermon on the Mount? Granted most Christians may be apostates when it comes to taking it seriously but can you really blame the Bible that people are the way they are? Yes there is language of an ultimate reward but that is because people are the way they are and the "just" deserve some ultimate reward. I think it will be on a physical earth after a resurrection but that is neither here nor there I guess.
2) The
Levitical Code did provide for a historically appropriate form of sustainable ag. Letting the land rest every seven years is among the best things you can do and it was around long before the modern conservaion movement.