From the Perkins + Will website: " We believe that it is appropriate to apply the precautionary principle when selecting and specifying products and materials in light of the lasting impact such materials may have on the users of facilities we design. We need to make our selections based upon governmentally published scientific advice and knowledge which, in keeping with the precautionary principle, indicates a relevant adverse finding as it relates to human health or materially negative environmental impact, with the understanding that we live in a world without scientific certainty. We will seek to, where possible and appropriate, present alternatives to our clients for their consideration, providing, within the standard of professional care, information we have which is summarized here, as well as cost and lifecycle information where it is reasonably available. We seek to empower our clients to make informed decisions. This list does not pretend to be exhaustive, or to reference all relevant published information. Again, in keeping with the precautionary principle, it represents information which we believe dictates appropriate caution and wisdom in design decisions made by design professionals. It is expected that users will exercise appropriate caution in use of this resource, and to conduct their own research so that they can make their own decisions and come to their own conclusions."