Heavy metals, pesticides, smog, PAHs and dioxins – every day we hear about the different elements and chemicals that threaten the biosphere, including man. What is the real risk? How to defend against them? Are these threats real or just catchy slogans? And why all of this combines ecology? The lecture "Principles of ecotoxicology" is going to answer these questions. Participants will discuss the major threats to the environment, the mechanisms of circulation and detoxification as well as the impact of toxic substances on populations and ecosystems. We will also look at the daily life in the aspect of toxic substances and ways of limiting our exposition to them.