This comprehensive course provides a foundational understanding of ecology, starting with the interdependence and competition between organisms, and how they are adapted to their environments. It thoroughly examines the complex flow of energy through food chains and investigates population dynamics using field methods like quadrats and transects. The course culminates in an analysis of critical global cycles (Water and Carbon) and the major environmental impacts of human activity, including global warming, deforestation, and pollution. Finally, it covers the principles of conservation and sustainable development required to maintain ecosystems and biodiversity for the future.