This educational video serves as a comprehensive introduction to the scientific evidence supporting climate change, framed through the historical lens of Guy Callendar, a steam engineer from the 1930s who first linked fossil fuel burning to global warming. The presenter guides students through a step-by-step evaluation of data, moving from basic definitions of weather versus climate to complex analysis of atmospheric trends. It emphasizes the scientific method, distinguishing between theories and proof, and challenges students to act as scientists by interpreting graphs and correlations themselves.