The flow of electricity in transmission lines also generates a magnetic field. Electric fields are strongly distorted by conducting objects (including the human body), but magnetic fields are little affected and freely pass through
biomass and most structures. Electric and magnetic fields both induce extremely weak electrical currents in the bodies of humans and other animals. These electrical currents are, however, several million times weaker than those induced by the normal functions of certain cells in the human body.
Transmission lines are controversial for various reasons. These include their poor aesthetics, the fact that they can destroy and fragment large areas of natural lands or take large areas out of other economically productive land-uses, and the belief of many people that low-level health risks are associated with living in the vicinity of these structures.
Aesthetics of Transmission Lines
Transmission lines are very long, tall, extremely prominent linear features. Transmission lines have an unnatural appearance and their very presence disrupts the visual aesthetics of natural landscapes, as viewed from the ground or the air. As such, transmission lines represent a type of "visual pollution" that detracts from otherwise pleasing natural or pastoral landscapes.
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