The soil of a farm field is forced to be the perfect environment for monoculture growth. This is achieved by adding nutrients in the form of fertilizer and water by way of irrigation. During the last fifty years, engineers and crop scientists have helped farmers become much more efficient at supplying exactly the right amount of both. World usage of fertilizer has tripled since 1969, and the global capacity for irrigation has almost doubled; we are feeding and watering our fields more than ever, and our crops are loving it. Unfortunately, these luxurious conditions have also excited the attention of certain agricultural undesirables. Because farm fields are loaded with nutrients and water relative to the natural land that surrounds them, they are desired as luxury real estate by every random weed in the area.

Your behaviors are usually a reflection of your identity. What you do is an indication of the type of person you believe that you are―either consciously or nonconsciously. Research has shown that once a person believes in a particular aspect of their identity, they are more likely to act according to that belief. For example, people who identified as "being a voter" were more likely to vote than those who simply claimed "voting" was an action they wanted to perform. Similarly, the person who accepts exercise as the part of their identity doesn't have to convince themselves to train. Doing the right thing is easy. After all, when your behavior and your identity perfectly match, you are no longer pursuing behavior change. You are simply acting like the type of person you already believe yourself to be.

Many human and non-human animals save commodities or money for future consumption. This behavior seems to reveal a preference of a 1delayed reward over an immediate one: the agent gives up some immediate pleasure in exchange for a future one. Thus the discounted value of the future reward should be greater than the un-discounted value of the present one. However, in some cases the agent does not wait for the envisioned occasion but uses their savings prematurely. For example, early in the year an employee might set aside money to buy Christmas presents but then spend it on a summer vacation instead. Such cases could be examples of weakness of will. That is, the agents may judge or resolve to spend their savings in a certain way for the greatest benefit but then act differently when temptation for immediate pleasure sappears.