Protection of seagrasses key to building resilience to climate change, disasters - new UN report – Un Environment

Nairobi, 8 June 2020Seagrass meadows can be a powerful nature-based climate solution and help sustain communities hard-hit by stressors such as the COVID-19 pandemic, but these important ecosystems continue to decline. The importance of seagrasses is highlighted in a new report, Out of the Blue: The Value of Seagrasses to the Environment and to People, released by the United Nations Environment Programme (UNEP) together with GRID-Arendal and the UN Environment Programme World Conservation Monitoring Centre (UNEP-WCMC).

 

Seagrass meadows are among the most common coastal habitats on Earth, covering more than 300,000 km2 in at least 159 countries. They nurture fish populations, weaken storm surges, and provide numerous other services to coastal communities. Seagrass ecosystems are biologically rich and highly productive, providing valuable nursery habitats to more than 20 per cent of the world’s largest 25 fisheries. They can filter pathogens, bacteria, and pollution out of seawater, and are home to endangered and charismatic species such as dugongs, seahorses, and sea turtles.

 

But an estimated 7 per cent of seagrass habitat is being lost worldwide each year, and at least 22 of the world’s 72 seagrass species are in decline. Since the late 19th century, almost 30 per cent of known seagrass area across the globe has been lost. The main threats to seagrass meadows include urban, industrial, and agricultural run-off, coastal development, dredging, unregulated fishing and boating activities, and climate change.

 

The report, launched on World Oceans Day, finds that seagrass ecosystems play an outsized role in combatting the climate crisis. Though they cover only 0.1 per cent of the ocean floor, these meadows are highly efficient carbon sinks, storing up to 18 per cent of the world’s oceanic carbon. Countries aiming to do their part under the Paris Agreement can include seagrass protection and restoration in their nationally determined contributions (NDCs) to help reduce the amount of heat-trapping carbon in our atmosphere.

 

"Maintaining the health of seagrass ecosystems – which provide food and livelihoods to hundreds of millions of people, support rich biodiversity, and constitute one of the planet’s most efficient stores of carbon – is important for healthy marine life and for healthy people around the world," said Susan Gardner, Director of Ecosystems Division. "Seagrasses represent powerful nature-based solutions to the climate challenge and sustainable development."

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