The current production rate of radioactive waste from nuclear electricity generation is about 0.4 million tonnes per year (excluding uranium mining and milling wastes): the current global generation rate of hazardous waste exceeds that of radioactive waste by three orders of magnitude. Further detail on the quantities of radioactive waste in the various classes referred to above is given in Appendix 1. Exposure to ionising radiation increases the risk of cancer in exposed persons in direct proportion to the degree of exposure.