Possible Clues:

• Actions that are becoming green blocking oil transporter
• Gentility
• Appropriate behaviour for environmentalist breaking into oil storage facility
• Behaviour that's becoming odd -- almost lure into trap at first
• Art style with strange decency
• Grace period at end of year with no booze
• Good form and spirit underpinning a style of art
• Etiquette of French? Well, I'm not sure
• Proper behaviour; etiquette
• Propriety requires new code — bottom less than totally visible!