This title suggests that the content will showcase real-world examples of brands that are excelling in sustainable marketing practices. It implies that these case studies will highlight specific strategies, campaigns, or initiatives that these brands have implemented to promote sustainability in their marketing efforts. By showcasing these brands as examples, the content aims to inspire and educate other marketers on how they can integrate sustainability into their own marketing strategies. The case studies are likely to cover a range of industries and marketing tactics, providing readers with actionable insights and best practices for incorporating sustainability into their marketing efforts.