Claudio Indao (R), a Portugese surfer and member of the Skeleton Sea art collective, shows participants in a workshop how to make sculptures from plastic waste collected from the sea at the Torre Madariaga Biodiversity Centre in Busturia, Spain, May 17, 2015. Skeleton Sea, a group of surfers and artists, recycle waste collected from the world's oceans to create artworks and draw attention to the dangers faced from overfishing, pollution and oil spills. (Photo by Vincent West/Reuters)

Xandi Kreuzeder (L) and Claudio Indao, surfers and members of the Skeleton Sea art collective, arrange a mobile during a workshop on how to make sculptures from plastic waste collected from the sea at the Torre Madariaga Biodiversity Centre in Busturia, Spain, May 17, 2015. (Photo by Vincent West/Reuters)

A participant in a workshop organised by Skeleton Sea makes a sculpture from plastic waste collected from the sea at the Torre Madariaga Biodiversity Centre in Busturia, Spain, May 17, 2015. (Photo by Vincent West/Reuters)

Participants in a workshop organised by Skeleton Sea make sculptures from plastic waste collected from the sea at the Torre Madariaga Biodiversity Centre in Busturia, Spain, May 17, 2015. (Photo by Vincent West/Reuters)

Participants in a workshop organised by Skeleton Sea make sculptures from waste collected from the sea at the Torre Madariaga Biodiversity Centre in Busturia, Spain, May 17, 2015. (Photo by Vincent West/Reuters)

Xandi Kreuzeder (L) and Claudio Indao, surfers and members of the Skeleton Sea art collective, arrange a mobile during a workshop on how to make sculptures from plastic waste collected from the sea at the Torre Madariaga Biodiversity Centre in Busturia, Spain, May 17, 2015. (Photo by Vincent West/Reuters)

Participants in a workshop organised by Skeleton Sea on how to make sculptures from plastic waste collected from the sea observe a mobile at the Torre Madariaga Biodiversity Centre in Busturia, Spain, May 17, 2015. (Photo by Vincent West/Reuters)

A sculpture of a fish made from waste products collected from the sea is displayed during the exhibition Keep The Oceans Clean by art collective Skeleton Sea, at the Torre Madariaga Biodiversity Centre in Busturia, Spain, May 17, 2015. (Photo by Vincent West/Reuters)

A sculpture of a fish made from waste products collected from the sea is displayed during the exhibition Keep The Oceans Clean by art collective Skeleton Sea, at the Torre Madariaga Biodiversity Centre in Busturia, Spain, May 17, 2015. (Photo by Vincent West/Reuters)

A sculpture of a fish made from waste products collected from the sea is displayed during the exhibition Keep The Oceans Clean by art collective Skeleton Sea, at the Torre Madariaga Biodiversity Centre in Busturia, Spain, May 17, 2015. (Photo by Vincent West/Reuters)

A sculpture of a fish made from waste products collected from the sea is displayed during the exhibition Keep The Oceans Clean by art collective Skeleton Sea, at the Torre Madariaga Biodiversity Centre in Busturia, Spain, May 17, 2015. (Photo by Vincent West/Reuters)

A sculpture made of driftwood is displayed during the exhibition Keep The Oceans Clean by art collective Skeleton Sea, at the Torre Madariaga Biodiversity Centre in Busturia, Spain, May 17, 2015. (Photo by Vincent West/Reuters)

A sculpture of a tuna fish made from waste products collected from the sea is displayed during the exhibition Keep The Oceans Clean by art collective Skeleton Sea, at the Torre Madariaga Biodiversity Centre in Busturia, Spain, May 17, 2015. (Photo by Vincent West/Reuters)