To be more straight: the pollution came from animals urine or guano, witch is NOT AT ALL pollutant under certain level of concentration (it's a good fertilizer

To be more straight: the pollution came from animals urine or guano, witch is NOT AT ALL pollutant under certain level of concentration (it's a good fertilizer for most plants, not a limited number) above such level it start to kill most plants. Now that's is a density issue: NL is a little country with a big population, so they can't expand much. Farms in the actual economic model need to be "intensive" witch means very dense and as a result pollutant. IMVHO some, really intensive, can collect urine/guano and sell them as a basic product to build fertilizers, that demand money, I do not know how many farmers have... Others have not much choice. Simply letting the country starve so people learn they need to eat and supermarkets does not produce food in their backyard might be of help not for NL in particular but for anyone who like to have all and want the pollution in someone else home... A bottomline disclaimer: I'm not Dutch, I do not live in NL and I'm not a farmer...