The goal of this article is to provide specific guidelines to help create effective proenvironmental public service announcements (PSAs). Campaigndesigners are encouraged to initially identify and investigate the optimal target audience and then draft and test reactions by samples of that audience using pilot messages. Designers are also advised to consider research on attitude persistence, memory, and social norms and apply this research to the message content and presentation style. The article concludes with an application of research from social psychology to a series of overallguidelines for effective PSAs. If environmental campaign developers follow these specifications, the chance of PSA success should be enhanced.