[[abstract]]Emissions of greenhouse gases have been, and continue to be, driven by economic growth; yet stabilization of greenhouse gas concentration in the atmosphere is feasible and consistent with continued growth, and it has led to the worldwide climate change, which threatens the basic elements of life for people around the world — access to water, food production, health, and use of land and the environment. According to Stern’s review, if we start to take strong action now, it would already be very difficult and costly to save the earth. However, if we delay, the opportunity may slip away. This proposal adopts the contents regarding energy-saving technologies on the Six Main-Course learning website to design informal class activities and lessons for 5/6 grade students. Those activities include lecture and discussion, online learning, hands-on assignments, competition and games. The purposes of the proposal are to provide opportunities for students to understand the impact that technologies have brought to us, and to learn the energy-saving technologies that he/she can apply in their daily-life to avoid the worst impact of the global warming.