While Jumelet sees benefit in abolishing the critical deposition value (KDW) and the nitrogen map, Professor of Ecology Han Olff argues in favor of preserving both. Opposite RTV North he wonders aloud if this is possible. “The KDW is an essential part of the Nitrogen Act. To determine these values, 20 to 30 years of research has been done. New research must now be carried out and a new law, which does not seem feasible within a year.”