AbstractAs some corporations begin to enjoy power and influence on a scale comparable with or even more extensive than governments, it is consumers rather than voters who are starting to hold the key to political and social change. Companies which fail to take consumer opinion into account face real threats to their brand image, and ultimately to their bottom line. This case study explores the Greenpeace‐led StopEsso campaign, detailing the campaign history, strategy and tactics, and assessing its impact so far. It shows how negative consumer perceptions of ExxonMobil (Esso), based around the issue of the company's approach to climate change, are damaging the company's interests and that the changing interactions of other key stakeholders with the company could also threaten Exxon's competitiveness.It concludes that as corporate power increases, so must corporate responsibility, for consumers are increasingly unwilling to accept dishonest or unfair behaviour, and increasingly willing to withdraw their financial support for companies which fail to respond to their expectations. Copyright © 2004 Henry Stewart Publications Ltd.