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Hazardous substances can remain in the environment for a very long time, and harm ecosystems and human health. Although monitoring indicates that the loads of some substances have been reduced in recent years, many problems still persist. The increasing number of these man-made substances present in the environment is a matter of concern, and calls for the application of the precautionary principle.

Agriculture has long been a major source of income for many people living in the Danube River Basin. Today however, it is also a major source of pollutants – including fertilizers and pesticides and facing emerging issues like water scarcity and droughts.