Possible Clues:

• Tight secrecy around port plays into The Green's agenda perhaps
• Passes on Green Card motions perhaps?
• Helps the environment, in a way
• Crazy secrecy about Labour lead plays into The Green's agenda perhaps
• Keeps getting mileage out of crazy secrecy about Labour leader
• Uses again, touching series of songs
• Passes on tips for Roman Empire series
• Converts waste material for use again
• Puts to new uses
• Uses again for another purpose