The paper presents the methodology of estimation of ecological effects. The ecological effects are understood as the reduction in air pollution achieved by using energetic willow wood instead of coal. The study was conducted in Skała municipality in Malopolskie Voivodeship. The research base used in the study was a detailed inventory of fallow lands occurring in the study area. The authors showed ecological effects calculated as the amount of carbon dioxide and sulfur dioxide which are not emitted into the air. Moreover, a significant reduction in nitrogen oxide emissions was recognized as additional ecological effects. The discovered ecological effects are very important for the analyzed municipalities, due to the neighborhood of Ojcowski National Park.

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