This lecture provides an introduction to the course on global energy challenges, focusing on the energy system and its historical context. The instructor outlines the course themes, including the energy transition, climate issues, and future energy technologies. Key topics discussed include the demands for energy, the evolution of energy systems, and the global and local challenges associated with energy consumption. The lecture emphasizes the importance of understanding energy types, their uses, and the implications of energy consumption on climate change. The instructor also highlights the role of renewable energy technologies and the socio-economic aspects of the energy transition. The session concludes with an overview of the course structure, including deadlines and project requirements, ensuring students are well-prepared for the upcoming topics.