In this Environmental Assessment and Circular Economy course, I guide you through the theoretical, legislative, and practical foundations of sustainability within business, policy, and industry. We explore key topics such as climate change, sustainability, the polluter pays principle, the European Green Deal, and the EU Taxonomy for Sustainable Investments. You will learn how to calculate and reduce both carbon and ecological footprints, apply eco-design strategies, and assess environmental impacts beyond emissions, including energy consumption, land use, waste, noise, and light pollution. We also analyze how digitalization influences these impacts and how circular solutions can optimize resource use and minimize waste. Through practical examples, I demonstrate how businesses, public administrations, and civil engineers can apply these concepts to foster the transition towards resilient and sustainable systems, enhancing employability in the green economy.