A number of general empirical studies on environmental requirements have been conducted by UNCTAD, the International Trade Centre UNCTAD/WTO (ITC), OECD and other bodies.
98. 贸发会议、贸发会议和世贸组织合设的国际贸易中心(国贸中心)、经合组织和其他机构就环境要求问题展开了一些一般性经验研究。