| Title | KEY SAW |
| Brand | GREENPEACE HK |
| Product / Service | CAR FREE DAY 2009 |
| Category | B02. Best use of Ambient Advertising: Special Build |
| Entrant | GREY HONG KONG, HONG KONG |
| Entrant Company: | GREY HONG KONG, HONG KONG |
| Advertising Agency: | GREY HONG KONG, HONG KONG |
Credits | |
| Executive Creative Director | Keith Ho |
| Creative Director | Keith Ho/Brian Ma/Alfred Wong |
| Copywriter | Alfred Wong/Colin Ruffel |
| Account Manager | Carol Chung/Billy Suen |
| Art Director | Brian Ma/Leo Yeung |
| Photographer | Ka On Chan |
To execute our idea, we used trees next to parking spaces around town. When drivers parked near these trees, they were met with a big car key that looked like it was sawing down the tree. This gave the message that by driving your car, you are destroying trees.