By Arthur Weissman, Ph.D, Green Seal President/CEO No one today would question the legitimacy of credible third-party environmental certification programs. This was not always the case, not so long ago. When Green Seal and several European ecolabels were starting up two decades and more ago, some large U.S. consumer product companies became alarmed. They protested in many forums and used many arguments to discredit our programs. They said that setting national environmental standards for products was impossible and unscientific because environmental impacts of manufacturing and use vary geographically and are subjective to the purchaser.