For many years, International Relations (IRs) has focused its discussion on politico-military theme, where the states were the main actor in this study. This tradition is known as realism. As time went by, the golden age of realism paradigm comes to an end because it couldn’t cope with the complicated problem faced by international community. That is why IRs begins to broaden and deepen its object of discussion to non-military topics, such as economics, politics, social, and environment. In a brief, IRs discourse moves from state security to human security. As what has been explained, economics is one of many sectors that get attention the most because this theme related to human activity on fulfilling their daily basic needs. But, this activity causes undesired effect to the environment, such as global warming, that should be handled as soon as possible. It encourages international community to begin paying attention to this issue at last decade. Global warming as the one of the biggest issue in environmental security is the trigger of it. This topic also made environmental issue to be IRs focus of study as well as another aspect, such as military, economics, and politics.