Greenpeace tours with the Beluga along the Danish, German and Polish Baltic Sea coasts to test water samples The water is tested for nitrate and phosphorous levels, temperature, oxygen and salt levels and for multi-resistant germs.
High numbers of animal factory farms lead to an increased production of liquid manure, which is later spread onto the fields, with traces eventually landing in the waterways after rainfall.
Taking a sample from a small bay on the west side of Tasinge, Denmark.