In the context of the implementation of the Resources and Waste strand of the Employment-Environment Alliance, Brussels Environment has conducted a study designed to quantify the flow of the materials, water and energy into the Brussels Region, which are then consumed, transformed or stored, and which then leave. The metabolic balance carried out in this context showed in particular that, due to its urban character and the predominance of the tertiary sector, the Brussels Region is characterised by a highly linear economy which is dependent on the exterior. The study also highlighted the quantitative size of certain flows, including in particular those related to the construction, agriculture and food sectors, as well as the fuel and petroleum product sectors.