Are electromagnetic fields really harmful to our health?

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Recently on the radio I had heard that electromagnetic fields can cause many diseases such as cancer, diabetes, and alzheimers. Because the world is becoming more dependent on electronics that there are electromagnetic fields everywhere. Some over lapping others. Stated in the report is that some countries were actually banning wifi in schools and libraries. And in one country the usage of cell phones are no longer aloud for those younger than 18 years of age. Have you heard of this? Do you think that electromagnetic fields really do us harm? Do you live in one of the countries that are taking precautions with this? If so, what are they doing about it?