The UK media have been running a story about a paper setting out the views of Professor Mel Greaves on the causes of childhood leukaemia, specifically how it is related to inadequate exposure to infections early in childhood. See a page on this site about these theories.
Childhood leukaemia is the disease that is most often linked to possible exposure to magnetic fields. See more on the evidence for that. Clearly, the more we understand about the causes, the better we will be able to understand whether EMFs play a role or not.
Some of the reporting mentions the issue of power lines and leukaemia. This whole site is devoted to providing as objective and factual a view of that issue as we can.