Friends of the Earth Australia has joined an international coalition of 20 public interest organisations in rejecting proposals to manage the risks associated with nanotechnology by using voluntary measures. The coalition has released an open letter (download below) rejecting explicitly the voluntary risk management framework proposed by DuPont and non-government organisation Environmental Defense. Voluntary risk assessment will leave the worst offenders unchecked and will be used to delay rigorous regulation and mandatory risk assessment. Protection of human health and the environment from nanotoxicity’s risks should not be optional.