Abstract: - Waste is representing an important environmental pollution source, not only for the soil and ground water, but also for the air. Deposit in open land fields is not allowed according European standards and the EU countries have met national regulations to close the exiting non-ecological deposits and turn them into ecological ones. Also the general management for the waste is to be accordingly re-evaluated and shaped in a novel. Waste is representing also an energy source that should be not wasted. The waste (mainly municipal waste) must be properly reused as it represents material and energy content. Combustion, fermentation and recycling are possible solution for turning the waste management into a business, also reducing simultaneously the environmental damages raised by the enormous waste quantities, nowadays. The presentation will focus on clean combustion and co-combustion of waste, and on technologies to turn the energy content of the waste into other cleaner energy sources. One will raise attention also about the barriers – technical and mental – to apply correct waste management, as well to the consequences of not given a correct input to this matter from the society and policy makers. Examples from the author’s experience and literature will elucidate the conclusions.