This ad helps put an image to a dried up earth and helps you understand that by wasting water, drying up earth is where we will be headed. It is a powerful ad because it uses bold words to emphasize the fact that earth could one day have NO more water. Then it tells you how you can help (by conserving it). And it tells you what will happen if you do save water (you'll save earth and you'll save lives).
Photo: Poster 2
Photo by: http://sudhirjaggidesigner.blogspot.com
