In particular, the Stockholm Convention on Persistent Organic Pollutants (2001) and the Minamata Convention on Mercury (2013) provide agreed international frameworks to address some of the heavy metals and hazardous substances. In many States, however, a great deal of capacity-building is still required in order to implement these frameworks. The agricultural revolution of the last part of the twentieth century brought with it problems for the ocean in the form of enhanced run-off of both agricultural nutrients and pesticides.