Introduction.- 1. Introduction to Monte Carlo (MC) method. Random variables in stochastic models.- 2. Stochastic model of the diffusion of pollutants in landfill management using Monte Carlo simulation.- 3. The role of risk assessment in investment costs management, based on the example of Waste Treatment (Gasification) Facility in the City of Konin.- 4. Stochastic analysis of the environmental impact of energy production processes, based on the example of ArcelorMittal Poland S.A. Power Plant, Unit in Kraków, Poland.- 5. Stochastic analysis, using Monte Carlo (MC) simulation, of the life cycle management of waste, from an annual perspective, generated by ArcelorMittal Poland S.A. Unit in Kraków, Poland.- 6. Summary.