Eco-labels are being used more frequently in the marketplace. Recently, carbon-neutral labels have emerged on product packaging and advertisements as a popular form of eco-label. How consumers view these specific labels is of both conceptual and practical interest. Therefore, in a mixed-experimental design building on congruity theory and Deighton's two-step model of advertising effectiveness, the authors examine how consumers view the credibility and environmental concern of companies who use these labels, as well as their resulting purchase intentions. A 2(product) × 2(label) × 3(information) mixed design was used to examine consumer perceptions and behavior intentions. Product category (environmentally neutral vs. environmentally harmful) was a within-subjects factor; the presence/absence of the carbon-neutral label and information (positive/negative/control) was both manipulated between-subjects factors. Results show that the presence of a carbon-neutral label in an advertisement, regardless of the type of product, leads to more favorable perceptions of company environmental concern. However, there is a more pronounced increase in consumer perceptions of company environmental concern for an environmentally harmful product than for an environmentally neutral product.