The Canadian Cancer Society is endorsing precautionary policies to limit human exposures to power line EMFs. "In the absence of 'hard science,' the society promotes the precautionary principle, which recognizes the value of taking common sense steps to prevent harm to human health or the environment," advises Barbara Kaminsky in a recent statement. South of the border, the American Cancer Society appears to be holding out for conclusive scientific evidence before suggesting anyone take action to limit EMF exposures.