How Serious is Frequency Pollution in Our Modern Society?

It is amazing these days that we can't get away from frequency pollution, and it seems this is one of the greatest biological experiments on humans in all of recorded history. We don't know what it's doing to the human race. Consider if you will that many homes and businesses have WiFi, and there are cell towers everywhere. And consider that you carry your cell phone with you and you even put it up to your ear, right next year brain, and it gives off low-level microwave frequency. It's cooking your brain, albeit at a very low rate.