All life on Earth has adapted to survive in an environment of weak, natural low-frequency EMF (in addition to the Earth's quasi-static geomagnetic field)
Natural low-frequency EMF comes from 2 main sources:
Sun and the thunderstorm activity.
But in the last 130 years,
Man-made fields at much higher intensities & with a very different spectral distribution have altered this natural EM background in ways that aren't yet fully understood.












