How does electromagnetic affect people in the world ?

That depends on the wavelength of the electromagnetic radiation.-- If the waves are long, then we use them for radio, TV, and cellphones.-- If the waves are shorter than that, then we use them for GPS in the car.-- If the waves are shorter than that, then we use them to heat meatloaf in the microwave oven.-- If the waves are shorter than that, then they warm us and theymake our plants grow ... like the ones we eat.-- If the waves are shorter than that, then our eyes use them to see with.-- If the waves are shorter than that, then they tan our skin.-- If the waves are shorter than that, then they can cause cancer on our skin.-- If the waves are shorter than that, then they can cause cancer and other diseases in places inside our body.