Fiona Llewellyn, marine project manager at ZSL, poses for a picture adding a plastic bottle to the work the Space of Waste, an art installation highlighting the problem of plastic pollution, at ZSL London Zoo in London, Britain on May 24, 2018. The work, by artist and architect Nick Wood, is 16 feet high and is made from 15,000 discarded single use plastic bottles collected from London and its rivers. (Xinhua/Tim Ireland)

A person poses for a picture adding a plastic bottle to the work the Space of Waste, an art installation highlighting the problem of plastic pollution, at ZSL London Zoo in London, Britain on May 24, 2018. The work, by artist and architect Nick Wood, is 16 feet high and is made from 15,000 discarded single use plastic bottles collected from London and its rivers. (Xinhua/Tim Ireland)

A person poses for a picture adding a plastic bottle to the work the Space of Waste, an art installation highlighting the problem of plastic pollution, at ZSL London Zoo in London, Britain on May 24, 2018. The work, by artist and architect Nick Wood, is 16 feet high and is made from 15,000 discarded single use plastic bottles collected from London and its rivers. (Xinhua/Tim Ireland)

Fiona Llewellyn, marine project manager at ZSL, poses for a picture adding a plastic bottle to the work the Space of Waste, an art installation highlighting the problem of plastic pollution, at ZSL London Zoo in London, Britain on May 24, 2018. The work, by artist and architect Nick Wood, is 16 feet high and is made from 15,000 discarded single use plastic bottles collected from London and its rivers. (Xinhua/Tim Ireland)

Photo taken on May 24, 2018 shows some of the bottles making up the work the Space of Waste, an art installation highlighting the problem of plastic pollution, at ZSL London Zoo in London, Britain. The work, by artist and architect Nick Wood, is 16 feet high and is made from 15,000 discarded single use plastic bottles collected from London and its rivers. (Xinhua/Tim Ireland)

Fiona Llewellyn, marine project manager at ZSL, walks into the work the Space of Waste, an art installation highlighting the problem of plastic pollution, at ZSL London Zoo in London, Britain on May 24, 2018. The work, by artist and architect Nick Wood, is 16 feet high and is made from 15,000 discarded single use plastic bottles collected from London and its rivers. (Xinhua/Tim Ireland)