I've been paging through some past issues of Communication Arts and arrived at this spread of trees in a bag. Done for the World Wildlife Federation, this ad campaign by Meridian Communications of Bangalore, India is meant to "inspire people to plant as many trees as possible to heal the environment. This is part of a campaign of 30 messages, each of which conveyed one benefit of planting trees."
While I think some of the messages are a little charged, I still like and appreciate the simple and strong graphic sensibility of the project. And besides, I am all for planting trees, so despite whatever message appeals to you the most, the bottom line is: trees are good ... plant one :)