Have you wondered what the world looked like when dinosaurs walked around the surface? The Earth is currently warming at an unprecedented rate since the dawn of industrialization. While most attention is focused on recent climate change and future projection, this interactive class will take a different perspective on Earth’s climate by looking into its past, over a range of time scales: from the far distant geologic past, dinosaur eras, then fast forward to the pre-historic past over human evolution. We will travel through time and look into how scientists piece puzzles together to reconstruct the past climate, how we think it has changed, and what we know about the evolution of biosphere and ecosystems at the turning points throughout the Earth history.