This lecture provides an overview of the course HUM-123b, focusing on global energy challenges. It introduces the teaching team and outlines the course themes, including the energy system, its history, and the transition towards sustainable energy sources. The instructor discusses the importance of understanding energy demands and the evolution of energy systems over time. Key topics include climate challenges, future energy scenarios, renewable technologies, and the socio-economic and geopolitical aspects of energy transitions. The lecture emphasizes the need for effective energy management and the implications of energy consumption on the environment. Students are encouraged to engage with the material and participate in discussions about energy transition and its significance in contemporary society. The session also highlights the structure of the course and upcoming deadlines for assignments and projects, ensuring students are well-prepared for the semester ahead.