If WiFi harms trees, what about children?

Via Magda Havas:

The debate about WiFi being used in schools continues to escalate as new research from the Netherlands shows that when ash trees are exposed to radiation emitted by WiFi base station antennas, the leaves discolor and gradually die. The study reported that 70% of all trees in urban areas (but not those in dense forests) show the symptoms, compared to 10% five years ago. Although this is a preliminary study, which has not yet been published, it should be taken seriously.