This course offers a broad introduction to the complex interactions between humanity and the Earth system. Particular attention is given to humanity's environmental footprint, including renewable resource management, pollution generation, and non-renewable resource depletion, with a focus on meeting the needs of the present without compromising future generations. The course is designed to equip students with the critical thinking skills necessary to make informed, socially responsible, and economically feasible decisions to protect the natural world. Key topics include the water-food-energy nexus, climate change and its impacts, resource accounting, emissions management, green design principles, and life cycle analysis. These topics provide students with a focused understanding of sustainability and earth system stewardship while maintaining a generalist approach that enables informed decision-making and the evaluation of practical actions for sustainability. The course is divided into two interrelated sections, delivered by Professors Matthew McCabe and Sami G. Al-Ghamdi: - Part I (by Matthew McCabe): This section covers the Earth’s climate system, including its water, carbon, and energy cycles, and examines the impacts of humanity on these systems. Topics include sustainable development challenges, global case studies, and the relationship between natural Earth system cycles and human-engineered systems such as food and water. Students will explore the physics underlying key processes and examine the consequences of climate change on Earth systems. This section is designed to provoke discussion and debate on sustainability challenges while exploring rational, evidence-based solutions. - Part II (by Sami G. Al-Ghamdi): This section emphasizes the role of sustainable engineering and the development of tools like Life Cycle Assessment (LCA) to evaluate environmental impacts. LCA considers the entire life cycle of products or systems, from production to disposal, and provides quantitative insights into environmental issues to inform decisions. Students will develop a practical understanding of LCA methodologies, databases, and software, learning how to apply these tools to real-world problems. By the end of this section, students will be equipped with the knowledge and skills to model sustainability from a systems perspective, perform material and energy balances, and contribute to environmentally sound engineering decision-making.