Natural and many human-made sources generate electromagnetic energy in the form of electromagnetic waves. These waves consist of oscillating electric and magnetic fields which interact differently with biological systems such as cells, plants, animals, or human beings. 

Current research indicates a variance of opinions and research coming from different people. For the most part, people claim that EMF radiation is an environmental hazard and is a concern for everyone, for it is often linked to cancer related syndromes and leukemia. Other research has said that this is misleading and although EMF does affect people, (through the human's natural melatonin) the impact is not very great . There is great controversy on EMF and its effects on humans.