diff -ru -X /home/jjm/cvs/no.freeciv FreecivCVS/server/settlers.c freeciv/server/settlers.c
--- FreecivCVS/server/settlers.c	Wed Jun 14 10:48:37 2000
+++ freeciv/server/settlers.c	Sat Jun 17 09:57:23 2000
@@ -517,7 +517,7 @@
   map_clear_special(x, y, S_POLLUTION);
   m = city_tile_value(pcity, i, j, 0, 0);
   map_set_special(x, y, S_POLLUTION);
-  return(m);
+  return(m * 4);  /* Pollution clean-up arbitrarily weighted more important. */
 }
 
 /**************************************************************************