Occurrence of Attributes in Original Text

The text related to the cultural heritage 'Pantanal Conservation Area' has mentioned 'Pollution' in the following places:
Occurrence Sentence Text Source
[18] Pollution from gold mining operations and agro-industry [21] The Pantanal is a natural water treatment system as it removes chemicals, including pollutants, from water.
[20] Pollution from sewage systems and pesticides [23] Movement to large-scale agriculture of food crops, mainly soy-beans, has adopted the use of large quantities of chemical pesticides and fertilizers which leach into the soil or run-off to the flood plains of the Pantanal.
Problems such as illegal sport fishing, disturbance of nesting areas and requests for deluxe items (source of pollution) require strict control.