Environmental chemistry is the scientific study of the chemical and biochemical phenomena that occur in natural places. It focuses on the sources, reactions, transport, effects, and ultimate fates of chemical species in the air, water, and soil, as well as their impact on living organisms. Drawing heavily on principles from analytical, organic, and physical chemistry, along with toxicology and biology, this applied field seeks to understand the extent of human-caused and natural contamination and develop solutions for pressing global issues such as pollution, waste remediation, and climate change.