From The Netherlands comes a very good materials site: Materia. We like it because they have a ranking of environmental friendliness for all materials and the broad spectrum of materials that they cover. From their website:
New materials present opportunities for fascinating innovations. Materia stimulates and inspires architects, designers and producers to apply these materials to their designs. The company is a knowledge centre for developments and innovations in materials, and their applications for architecture and design. Materia is familiar with many innovative materials from all over the world, as well having knowledge of their specific characteristics. This knowledge is published worldwide by Materia using various media.
Enjoy. Thanks Clive.