It's not easy to imagine 3G, RF signals or WIFI so a little help is needed?
EMF rays are so easily forgotten because they are completely invisible. They are a firm of dangerous pollution one does not see and accordingly discounts.
Such radiation did however contribute to many extinctions of species on earth and science is learning gradually how it contributes significantly to the evolution of life itself, your very own life cycle and the ageing of cells that you rely on.
RT