A remote South Atlantic island is home to thousands of pieces of plastic debris.
Some of the litter found on the south-western coast of Ascension Island was traced back to China, Japan, and South Africa.
The ZSL team assessed the extent of plastic pollution there.
There are more than 900 species of marine life.
The land crab is one of the species that have been affected by plastic pollution on Ascension Island.
The British-owned island has been subject to a number of schemes to conserve its natural flora and fauna.
There is too much plastic being used and it's bad for the environment.
She said that big brands and governments needed to be made to account for the mess.
More than 7,000 pieces of plastic waste were found in a single beach hut during the expedition.
The small island is worried about the crisis. There is a small amount of plastic that washes up on the shore. Most of it is coming from somewhere else.
The plastic can cause harm if it is swallowed by animals. Microplastics work their way up the food chain.
Some of the types of plastic found on the island's coastline include plastic bottles, hard plastic fragments that have broken down, fishing gear and cigarette butt.
Many of the waste ends up on rugged cliffs that are difficult to reach. She said it was difficult to get to the shoreline and count all the plastic that was there.
The ZSL Marine team was part of a collaborative effort to tackle plastic pollution with other groups.
The project will last for three years and will include monitoring the currents and movement of water, identifying the plastic bottles and assessing their production dates to determine when they might have entered the water and where from.