Paul Anastas, Yale's Introduction to Green Chemistry, walks through Module 8 on catalysis, explaining how catalysts change the economics and environmental footprint of industrial chemical processes. He demonstrates a catalyst experiment to show how a small amount of an active substance can speed a reaction and reduce the energy and raw material needed to reach a product, connecting the demonstration to broader claims about waste reduction and efficiency in manufacturing. The segment sits within a larger course sequence covering green chemistry principles, and this module isolates catalysis as a case study in how chemical design choices ripple out into industrial and environmental consequences. Anastas keeps the explanation grounded in the hands-on experiment rather than abstract theory, making the mechanism of catalytic acceleration visible before drawing out its implications for sustainable chemistry practice.