Explore the frontiers of multiscale systems modeling in this SIAM Geosciences webinar. Delve into the challenges of accurately modeling energy and geologic systems, focusing on the development of rigorous models at larger scales. Learn about coarse-graining techniques for scale translation and error bounding. Discover Symbolica, a software prototype for automatic upscaling through symbolic computation, designed to overcome human limitations and accelerate model development for complex processes. Gain insights into nonlinear reactive transport, optimal multiscale frameworks, and the future of computational physics. Engage with topics ranging from simple to complex systems, physical interpretations, and equilibrium models. Conclude with a discussion on future developments and the potential of symbolic computation in advancing the field.