Entire species of sea creatures could be wiped out if we fail to stop a vital marine plant from being eroded, scientists have warned.
Many creatures - from manatees to sea horses - need seagrass to survive.
A report by the United Nations shows that 15% of the world's seagrasses have disappeared in the past 10 years.
Seagrasses grow in shallow waters, where boats are often moored. The chains from buoys and the boats' anchors are destroying the plants.