Last year at about this time an International Agency for Research on Cancer study came out with the following finding:
An increased risk of brain cancer is not established from the data from Interphone.The overall conclusion of no increased risk is in accordance with the large body of existing research and many expert reviews that consistently conclude that there is no established health risk from radio signals that comply with international safety recommendations.
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There are no far-reaching conclusions from the results. Based on the information now available, it can not be concluded that the WiFi radio signals lead to damage to trees or other plants