Through photosynthesis, trees absorb Co2 gases and split them into carbon and oxygen. While oxygen improves our air, carbon bonds with the wood for years. During combustion, only the amount of carbon which has been previously stored is released. Therefore, the combustion of wood is Co2 neutral.
The soil is stabilised by root growth, which reduces the risk of erosion. Dropped leaves increase the organic substance and as a result the water storage capacity. Furthermore, the leaching of nitrate into the groundwater is reduced and the quality of drinking water is improved.
In addition, willows are specifically used to bind free-moving heavy metals in the soil. The 50 - 80% cheaper method for sustainable remediation of contaminated soils is already increasingly used in the United States and Great Britain.