Prior informed consent ( Rotterdam Convention ) 32 . As a result of continuous collaboration that began in 1989 between FAO and UNEP on the principle of prior informed consent ( PIC ) ,11 on 10 September 1998 , the Conference of Plenipotentiaries , held in Rotterdam , the Netherlands , adopted the Rotterdam Convention on the Prior Informed Consent Procedure for Certain Hazardous Chemicals and Pesticides in International Trade .