Number 4 on my list of the top-10 green building priorities is to reduce the need for driving.

Since I've been writing this weekly column on innovative green building products, the most interesting products have been brought to my attention. CC Expanding Sealer is the latest.

While in California two weeks ago, I visited the headquarters of Xicato, one of the most exciting companies in the burgeoning LED (light-emitting diode) lighting industry. CEO Menko DeRoos explained the company's modular approach to LED lighting and demonstrated the exceptional light quality that is achieved with their system.

Number 7 on my list of the top-10 green building priorities is to protect and restore the site.

Number-eight in my list of the top-10 green building priorities is to use "green" or low-environmental-impact products and materials.

Clear signage can help us find our way, it can inform us, and--in a green building--it can highlight environmental features. That signage can also, itself, make a statement about the environment.