I see green as fresh wood planks harvested from trees, wood bowl blanks freshly turned from logs that have been recently downed and waxed up put into brown bags or put into a controlled atmospheric area or just sealing the ends of logs to stop the quick dry of ends of logs to allow even expelling through the bark or wood planking to stop cracking.
Green also could be someone who has no experience and just getting started in woodworking. Moreover, the experienced woodworkers trying a new area of woodworking like intarsia, veneers and vacuum pressing, or lathe turning as examples.
Another area of green could be working with chemicals as pressure treated lumber. Thats soaking wet at times. Or aging wood.

Thanks Ms Debbie and happy St. Patrick’s day to you.

Jeff Vandenberg aka "Woodsconsin"