The document discusses harmony in nature through the lens of four orders: physical, bio, animal, and human. There is a relationship of mutual fulfillment between these orders, with the first three fulfilling each other and human beings. For humans to live in harmony with nature, they must understand this inherent mutual fulfillment and live accordingly by facilitating an environment conducive to the activity, innateness, and inheritance of all orders. Problems like climate change indicate a lack of understanding of nature and how human participation can preserve and enrich it while also meeting human needs.