The amount of plastic recovered during the plankton study has increased significantly in recent decades

Frequency of plastic

occurence per tow

4%

3

2

1

0

1950

1960

1970

1980

1990

2000

2010

Frequency of plastic occurence per tow

4%

3

2

1

0

1950

1960

1970

1980

1990

2000

2010

2016