translate English to German: Even if animal husbandry were to become much less intensive, it would still be over 20 years before the surface and ground waters in the EU were even reasonably healthy again.
Selbst mit stark abnehmender intensiver Tierzucht würde es noch über 20 Jahre dauern, bevor die Grund- und Oberflächengewässer in der EU wieder halbwegs gesund sind.