Sources: ISAG-reports for 1996 to 1999, (1) Association of Danish Recycling Industries and other large scrap dealers, (2) Elsam and EK Energi, (3) Reports to the Danish Environmental Protection Agency on sludge from municipal wastewater treatment plants applied to farmland etc. (figures from 1998 have been used. Sludge in long-term storage has been included in amounts of sludge applied to farmland etc.. Sludge for recovery has been included in amounts of sludge incinerated), (4) Correction for ferrous metals removed from waste incineration plants has been made to avoid double counting. Some of the collective terms such as "Other recyclables", "Other construction and demolition waste" and "Soil and stone" may contribute – after separation has been completed – to additional quantities of items such as tiles, wood etc.