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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.

The floodplains and wetlands of the Danube basin are uniquely valuable ecosystems in global terms, although few areas are still in their natural or near-natural state.