The second issue concerns not only the level of exposure but also the long-term effects. How can it be said exposure for 40, 50 or 60 years is safe when there is not enough evidence, studies or knowledge? The same could be said of the medium to long-term consequences of incineration, even from the best incinerators, although incineration is on a much lower plane. The medium to long-term consequence of radiation cannot be known. For example, it cannot be known if the reproductive organs of a generation of young people are being slightly affected by exposure to low level radiation. It may be one or two generations before the damage becomes apparent.