There are certain requirements that agriculture must meet to produce food and to keep producing food. We should view them as a hierarchy, such that if the top requirement is not attained, the lower requirements do not mean much, but once the top requirement has been met, we can move to the next one, provided that how we do it does not threaten any of the requirements above it. Each component is required, but not sufficient; all of them are needed.
Just about every decision made on a farm will send ripple effects throughout the entire system; these decisions will influence the cost/benefit ratio of many future decisions. This complexity makes it difficult to make rapid changes, and is a major reason why many farmers tend to be pretty conservative in their farming decisions. Even if a farmer wants to try something new (a new technology, or a new crop, for example), that option may be precluded by decisions that were made last year, or even many years ago.
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