The distinctive boats used by fishworkers in Andhra Pradesh, India. Their unique design, with a curvy end and flat middle, enables stability in the waters of Andhra Pradesh, reflecting the ingenuity of local fishermen. Credit: Aishwarya Bajpai/IPS

By Aishwarya Bajpai
NEW DELHI , Jun 8 2024 (IPS)

The area where land meets the sea, known as coastal ecosystems, could be the key to reducing the effects of climate change.

What is blue carbon?

Blue carbon refers to the carbon dioxide (CO2) stored within marine or coastal ecosystems worldwide. These ecosystems include coastal plants such as mangroves, seagrasses, and salt marshes, which trap CO2 in their seabeds.

Why is it important?

The coastal ecosystem provides a protective shield, safeguarding communities from the adverse effects of natural disasters and climate change by maintaining cooler temperatures, even in summer.

How do we know this?

Research indicates that, despite covering less than 5 percent of the global land area and less than 2 percent of the ocean, coastal ecosystems store approximately 50 percent of all carbon buried in ocean sediments. Remarkably, they can store 5–10 times more carbon than land-based forest patches. These carbon stores can extend up to 6 meters deep, with layers dating back thousands of years. As the largest carbon sink (the ability to absorb carbon dioxide from the atmosphere), they play a crucial role in reducing the effects of climate change by absorbing 90 percent of excess heat and 23 percent of man-made CO2 emissions.

What else do coastal ecosystems do?

Coastal ecosystems serve as a barrier against natural disasters like floods and storms and contribute to climate regulation in coastal regions. They provide habitat for coastal animals and support communities dependent on coastal resources for food and livelihoods, particularly ocean people and fishworkers globally.

In the Indian state of Goa, women traditionally perform the early morning ritual of drying fish. Credit: Aishwarya Bajpai/IPS

What happens if coastal ecosystems deteriorate?

More than one-third of the world’s population or about 1.4 million people resides in coastal areas and small islands, comprising a mere 4 percent of the Earth’s total land area. For example, mangrove loss has soared to 40 percent since 1970, while coral reefs have witnessed a 50 percent decline since 1870.

At the same time, the global coastal population has surged, from approximately 2 billion in 1990 to 2.2 billion by 1995, encompassing four out of every ten people on the planet.

What does the sea tell us about global warming?

Over the past five decades, more than 90 percent of the Earth’s warming has been observed in the ocean. Recent research suggests that approximately 63 percent of the total increase in stored heat within the climate system from 1971 to 2010 can be attributed to the warming of the upper oceans, while warming from depths of 700 meters to the ocean floor contributes an additional 30 percent.

What are the impacts of this global warming?

Specifically in the Indian context, between 1950 and 2020, the Indian Ocean experienced a temperature rise of 1.2°C. This warming trend has led to the rapid intensification of cyclones, with projections indicating a tenfold increase in cyclone formation, from the current average of 20 days per year to an estimated 220–250 days per year.

So, how can blue carbon combat climate change?

Blue carbon ecosystems are crucial to combating climate change because they are an effective carbon sink. For example, mangroves, renowned as one of the most carbon-rich forests in the tropics, boast an average annual carbon sequestration rate ranging from 6 to 8 Mg CO₂e/ha, surpassing global rates observed in mature tropical forests.

Can we revive our coastal ecosystems?

Yes, there are several ways to do so, including carbon capture technologies and strategies like phytoplankton blooms, where fertilizing the ocean with nutrients can enhance carbon uptake. We could also use wave pumps to transport carbon-saturated surface waters down into the deep ocean, aiding carbon sequestration. Another method includes adding pulverized minerals to the ocean, which can absorb greater amounts of carbon dioxide, contributing to carbon capture efforts.

We should also ensure our policy frameworks reduce carbon footprints, including actions to conserve natural systems and reduce emissions.

There should be ongoing research and training for skilled carbon capture system experts.

Therefore, countries around the world can protect their future, biodiversity, and the planet by encouraging conservation of coastal ecosystems.

This feature is published with the support of Open Society Foundations.

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Excerpt:

Dr Essam Yassin Mohammed explains the characteristics of corals adapted to turbid water environments. Credit: Sean Lee Kuan Shern/WorldFish

By Neena Bhandari
SYDNEY, Jun 7 2024 (IPS)

The Global South is crucial for ensuring aquatic food security to feed the growing world population. It is imperative that blue economy initiatives benefit fishing communities in developing and small island nations, which are facing disproportionate impacts of climate change, says Dr Essam Yassin Mohammed, Director General of WorldFish, an international non-profit research organization based in Penang, Malaysia.

“More than three billion people depend on aquatic foods as their main source of protein and micronutrients, and nearly 800 million people rely on fishing for their livelihood. The Global South produces a significant portion of the world’s aquatic food and 95 percent of the fishing workforce comes from these regions,” notes Mohammed, who is also CGIAR’s Senior Director of Aquatic Food Systems.

Growing up in Eritrea’s capital, Asmara, situated on a highland plateau 2325 meters above sea level, Mohammed learned the value of food early in life. The country had recently gained independence from Ethiopia in 1991, and young children like him were motivated to contribute to the nation’s food security.

“Eritrea, a coastal country by the Red Sea, had abundant fish and marine resources. We believed these resources would be critical in making the country food secure so some of us decided to study marine biology and fishery science,” he adds.

While working for Eritrea’s Ministry of Fisheries, he was tasked with enhancing fish consumption amongst the Highlanders, who traditionally had no connection with the sea. He then realized that driving behavioral change in people’s diets, while considering cultural food preferences, is far more complex. To meet this challenging task and to better understand the interaction between humans and the ecosystem, he decided to train as a development economist.

“Integrating fisheries science with economics has profoundly shifted my viewpoint and deepened my comprehension of the intricate interplay within socio-ecological systems. This has defined my career, and I have never looked back,”  says Mohammed, who is committed to improving fisheries and aquaculture amidst the challenges of climate change, habitat degradation, and aquatic animal diseases.

Shifting ocean currents and warming waters are having a significant impact on fish stocks and coastal infrastructure, inundating lands and altering marine ecosystems, which is affecting the productivity of some fish species and forcing them to migrate to more optimal environments.

He says, “While large-scale commercial fishing vessels can still pursue and catch these fish say 20 km away, it is technically and financially prohibitive for small-scale operators with small boats to do so. This is where climate change becomes a social justice issue, impacting coastal communities’ access to food and causing loss of livelihoods and cultural identity.”

“At WorldFish, we are going beyond helping communities become climate resilient by creating viable livelihood opportunities, which include development of climate-resilient fish strains, adoption of sustainable aquaculture practices and assisting governments strengthen their fisheries policies, for fishing and fish farming-dependent communities to thrive under a changing climate,” he adds.

WorldFish research is helping prevent aquatic animal diseases, which cause an estimated global annual loss of over USD 6 billion, by ensuring that the food being produced is safe for human consumption.

“One of the critical aspects of fish farming is that once fish are exposed to a disease, the entire stock can perish.

We are democratizing fish health diagnosis with Lab in a Backpack initiative. It’s a compact digital tool that enables fish farmers to quickly diagnose the disease, contact service providers for treatment advice, and also learn how to deal with anti-microbial-resistant  diseases,” he explains.

The initiative is helping fish farmers build their capacity for the best biosecurity management practices by integrating the One Health approach, which prioritizes the health of fish, the environment, and people.

Besides diseases, plastic pollution in the ocean poses a significant threat to marine life and ecosystems. In November 2024, governments will meet for the final round of UN negotiations for a global treaty to end plastic pollution.

Mohammed says, “Once plastics enter the ocean, they are there to stay indefinitely. We have seen many instances of plastics harming marine life—straws stuck in the nostrils of turtles or dolphins—and now traces of microplastics have been found in fish tissues. It means those microplastics are being ingested by human beings, impacting their health too.”

“We need a legally binding treaty to mitigate plastic pollution. There is a global consensus now, but this needs to be followed by action on minimizing and eliminating plastic use and establishing a robust waste management system,” he adds.

Mohammed warns that many developed countries are prioritizing short-term economic gains at the cost of long-term sustainability and conservation of the global marine ecosystem. “We need to perceive the natural capital—marine life, oceans, and water bodies as economic infrastructure; and reinvest in them to ensure they continue to provide for us in the future,” he asserts.

According to the World Bank, blue economy is the “sustainable use of ocean resources for economic growth, improved livelihoods, and jobs while preserving the health of the ocean ecosystem.”

Currently, investments in blue economy initiatives are not percolating down to developing countries. WorldFish research reveals that from 2017 to 2021, USD 5.9 billion allocated to blue economy initiatives was concentrated mainly in Europe and Central Asia, and 35 percent of examined projects had potential risks for creating or exacerbating social inequities.

“Blue economy investments must benefit developing countries and small island nations. Those who are farthest behind must be able to benefit the most,” Mohammed tells IPS.

The total fisheries and aquaculture production (excluding algae) is expected to reach over 200 million metric tons in 2030, according to the United Nation’s Food and Agriculture Organisation.

“Small-scale operators in the Global South supply up to 50 percent of aquatic food consumed globally. Ensuring that investments in the blue economy benefit these communities is essential for achieving shared prosperity and addressing climate change impacts on food security,” says Mohammed.

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