Overhead or underground?

THE ESB says there is no evidence high voltage transmission lines are harmful to health (Irish Examiner, May 18).

This is not true there is a lot of evidence, but arguably no proof. But neither is there proof they are harmless.

Given that there are theoretical reasons for believing electromagnetic fields could be harmful, and knowing the history of hazards such as radiation, tobacco, asbestos, DDT, thalidomide, etc, a cautionary principal is needed.

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