I see no real definition of what constitutes a “green job” in the article. Just some vague allusions as to how they come up with it.
You will love this fron the NYT: the BLS definition of green jobs jobs in businesses that produce goods and provide services that benefit the environment or conserve natural resources.
http://green.blogs.nytimes.com/2012/03/22/a-tally-of-green-jobs/