Cell phones give off a lot of radiation. Additionally and most importantly, they consume a lot of energy which often come from poor sources. The new 4G phones are said to consume much more energy.
A more importan issue is probably the disposal of the phones themselves and the batteries that run them.
The radiation ell phones give off is non-ionizing radiation, not to be confused with radioactive raiation. Every radio transmitter produces radiation: that’s their job. The bigger the transmitter the more radiation. If cell phones give off “a lot of radiation” it is because there are so many of them, but that also means the radiation is diffuse, like sunlight. However it is not diffuse to the user holding the cell phone next to his brain, and some people believe this is a problem, though not yet proven.
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