What are the motifs in Prodigal Summer: A Novel by Barbara Kingsolver?

Man vs. Nature is a recurring idea. The characters in this story are surrounded by nature in the mountains and valleys of Appalachia. How they will either help to restore and protect nature and its balance, or protect their farms, crops, and livestock is constantly on their minds. It represents a disagreement between humans about our role on this earth. Are we here to protect nature in the way it exists, aid in restoring it to the way it had been, or use it for our own purposes and desires?