. >> two pbdes, penta and octa, were taken off the u.s. market voluntarily in 2004 because of growing health concerns. production of the pbde deca is in the process of being terminated. >> the problem with all of these pbdes is that t they arere very persistent in the environment. >> the i issue with pbdes is tht ththey've been replalaced withtr types of chemicals ththat may he very sisimilar concerns and perhaps even the same mechanism of action, i in terms of their ability to disrupupt the endocrine s system. >> the flame retardants chlorinated tris and fire master 550, which may be linked to dna damage, cancer, or neurological defects, continue to be widely used in polyurethane foam in a number of common children's' products. >> so i think that the whole issue of flame retardants is one for which there is s some conce, and i think the real question we should ask, and maybe we n d to ask this more broadadly of other kinds of chemicals as well, is, do w we really need them? >> when it comes to endocrine disruptors, one of the most toxic p