Could the commercial use of frequency specturms for TV, Radio and wifi be harmful to the planet?

Nobody knows why exactly we have this frequencies and what their NATURAL purposes are so with the introduction of Super-Wifi which uses a lower frequency could there be any potential long-term or even short-term consequences for the planet, especially since their is only a finite amount of frequencies available. Is it wise to high-jack these frequency spectrum's with our communications technology when we still don't fully understand why these frequencies are there and what their natural purpose is.