The document provides an overview of the key principles of engineering and science for environmental problems. It discusses the principles of mass and energy transfer including the laws of conservation of mass and the first and second laws of thermodynamics. It also discusses environmental chemistry concepts like stoichiometry, chemical equilibrium, organic chemistry, and nuclear chemistry. Additionally, it covers the mathematics of growth and risk assessment, which involves hazard identification, dose-response assessment, exposure assessment, and risk characterization. The document is intended to provide students with an introduction to these fundamental concepts.