Discarded fishing lines and nets can cause serious injuries to the mammals and even lead to their deaths.
The vast quantities of plastic already in the environment could cause global problems.
The new law bans nine plastic products, such as single-use straws and cutlery, often found littering the beaches of Europe.
Not even some pristine tropical isles are free from the scourge of abandonded fishing nets.
"Swimming close to the shore with my family I was constantly fishing out plastic bags," a reporter in Thailand explained.
New research suggests ocean plastic is being transported back onshore away from the water’s edge.