Firstly,what one can observe through the analysis of the BL is that ,even when the productive processes do not generate emission pollution,or do so in a direct,indirect and induced contamination. So,for example ,agriculture has a low characteristic effect in atmospheric contamination (73,000 for each million Euros),but the direct effects rise to 580,000 ,the emissions that the productive system generates to satisfy the derivative demand of the agricultural industry causes another 370,000 GE ,and by the circular flow of the income -induced effect -an additional 622,000 Consequently ,one of the seemingly less polluting activities of the productive system , with emissions four times lower than average,becomes the most polluting activity when you analyse the whole economy.Something similar occures with the requirement of water for this branch.