At the top of the blog under "Keeping Track of Our Work," you can see the list of labels we'll begin with (and a little more explanation to go with them). Remember that the point of using the labels is to help us find information quickly in the blog archives. So think of them as similar to search terms or keywords.
Labels can also be tweaked later if you change your mind. We'll get that all smoothed out by the time Earth Day rolls around!