Final answer:
The statement that EMFs are harmful to human health is not true, according to scientific reviews and demographic studies. EMFs produced by power lines are non-ionizing and not strong enough to cause health damage.
Step-by-step explanation:
Among the statements regarding electromagnetic fields (EMFs) on his property, the one that is NOT true is b) EMFs are harmful to human health. While there is an ongoing controversy, and some people have raised concerns about potential health hazards such as cancer, scientific reviews and demographic studies have found no consistent, significant link between cancer and exposure to EMFs from power lines. These power lines produce non-ionizing radiation, which is not strong enough to cause damage according to these studies. Regarding the other options, a) EMFs can be generated by electrical appliances is true; c) EMFs decrease with distance from the source is a known principle, as the strength of any electromagnetic field diminishes with increasing distance from its source; and d) EMFs are a natural part of the environment is also true since the Earth itself has a magnetic field and solar radiation constitutes a natural source of electromagnetic fields.