WAL-MART WITH A GRASS ROOF?

In an effort to quiet critics, Wal-Mart Canada Corp. has hired a leading "green" architecture firm to design an eco-friendly store in Vancouver. The new Wal-Mart may even have a sod roof, according to a report in Canada's National Post.
What is "green architecture"? I've posted a few of my favorite links and resources on our Green Building Concepts page.