If you seek environmental ads with a strong message and clever imagery, look no further than the WWF Evollution campaign. The organization has always been known for cutting edge and sometimes even controversial advertising, but it has proven to be quite effective at marketing itself and its causes.
Often eco-campaigns can be the most graphic and disturbing in terms of visuals, but that is only because of the urgency of the message. It is unlikely Pepsi would ever use a bloody animal to sell you a soda.
The WWF Evollution campaign was headed by Ross Moody and will hopefully inspire some to become involved in environmental activism or to donate to a worthwhile cause at the very least.