The document discusses the concept of being a global citizen and provides three cases as examples. It defines a global citizen as someone who cares about the world and its people. Case 1 discusses how the Amazon Rainforest in Manaus, Brazil is being destroyed, threatening biodiversity. Case 2 talks about economic trends like prosumers, prestige products, and the caffeine-latte index. Case 3 examines different cultural eating habits around the world like snails in France and dog meat in Korea. The document concludes by calling for global cooperation to help people and protect the environment.