Environment

Ocean conservation untapped strategy for fighting climate change

Wednesday, June 27, 2018

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The ocean contributes US$1.5 trillion annually to the overall economy and assures the livelihood of 10-12 per cent of the world's population. But there's another reason to protect marine ecosystems — they're crucial for curbing climate change.

“Blue carbon” ecosystems, such as mangroves, seagrass meadows and kelp forests, are 10 times more effective at sequestering carbon dioxide on a per area basis per year than boreal, temperate, or tropical forests and about twice as effective at storing carbon in their soil and biomass. They also play a crucial role in protecting coastal infrastructure and communities from climate impacts, including the effects of extreme weather events.

Mangroves are found in 123 countries and territories and are estimated to cover more than 150,000 square kilometres globally. They buffer coastal communities from wind and waves, acting as a frontline defence against storms and sea level rise.

If the world halted just half of annual coastal wetlands loss, it would reduce emissions by 0.23 gigatonnes — Spain's total annual emissions in 2013.

Restoring coastal wetlands to their 1990 extent would increase annual carbon sequestration by 160 megatonnes a year, equivalent to offsetting the burning of 77.4 million tonnes of coal.

Commitments made by countries to advance climate action in line with the goals of the Paris Agreement are a vehicle and an opportunity to advance action on both agendas. But the ocean and coastal ecosystems are currently underrepresented in these commitments, known as Nationally Determined Contributions (NDCs).

There are a number of policy options for incorporating blue carbon ecosystems into NDCs. These include:

• Creating or protecting blue carbon ecosystems (including through marine protected areas). This includes establishing buffer zones to reduce impacts from adjacent land-use and allowing mangroves to migrate inland in response to sea level rise.

• Reforesting or rehabilitating degraded blue carbon ecosystems.

• Introducing incentives to create new or protect existing blue carbon ecosystems on privately owned land, including through access to carbon markets.

• Ensuring the mitigation potential of blue carbon ecosystems is included in national greenhouse gas inventories.

Of course, curbing climate change isn't the only reason to invest in ocean and coastal ecosystem protection. Coastal ecosystems can also buttress the resilience of coastal communities to natural hazards — including storms (mangroves absorb the energy of storm-driven waves and wind), flooding, erosion and fire. Wetlands provide nurseries for the many species of fish that support economies and improve food security. And marine protected areas can also protect biodiversity.

Fighting climate change is yet another benefit the ocean provides us. It's time to start recognising its protection as a climate change solution.

This year is shaping up to be a critical one for ocean action. The observance of World Oceans Day on June 8 had an action focus to prevent plastic pollution. The 53 member countries of the Commonwealth adopted the Commonwealth Blue Charter on Ocean Action earlier this year — a plan to protect coral reefs, restore mangroves and remove plastic pollution, among other actions. Ocean conservation was the centrepiece of the G7 meeting. Kenya is holding the inaugural blue economy conference in November. And substantial negotiations for a new UN treaty for conservation of the high seas will begin in September.

This year is also a turning point for international climate action. The first stocktake of progress under the Paris Agreement on climate change, known as the Talanoa Dialogue, is currently underway, and is expected to highlight tangible opportunities for countries to further advance climate action. Countries are also expected to agree later this year on a rulebook for implementing the Paris Agreement.

The ocean and coastal ecosystems provide an untapped, nature-based climate solution that needs to be part of both conversations.

— World Resources Institute

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