Final answer:
The undesirable consequences of well-intentioned treatments are referred to as side effects, which can include a wide range of unforeseen impacts of health and economic activities.
Step-by-step explanation:
The undesirable consequences of well-intentioned treatments are called side effects. While treatments may be developed with good intentions, such as creating a corn seed resistant to weed killers and pests to reduce the use of harmful chemicals, there can be unforeseen side effects, like the resistant corn unintentionally spreading to other fields. This is similar to the concept of externalities, which are unintended consequences of an economic activity, whether positive or negative, like the diverse impacts from building a dam for electricity or flood control.