News / Asia

    Coastal Trees Help Fight Global Warming

    Mangroves found to store more planet-warming carbon dioxide than previously thought

    A tall mangrove forest on the island of Borneo. Mangroves often reside on thick sediment layers rich in organic matter, resulting in carbon storage exceeding most tropical forests.
    A tall mangrove forest on the island of Borneo. Mangroves often reside on thick sediment layers rich in organic matter, resulting in carbon storage exceeding most tropical forests.

    Multimedia

    Audio

    A new study says the world's tropical coastal forests store more planet-warming carbon dioxide than almost any other ecosystem.

    But rapid loss of these forests - known as mangroves - is releasing substantial and previously unrecognized quantities of greenhouse gases into the atmosphere.

    Mangroves provide rich breeding grounds for fish, and they help buffer coastal areas from storm surges. But their role in trapping climate-warming carbon dioxide has not been studied much.

    A new study in the journal "Nature Geoscience" provides a first look.

    More carbon per hectare than tropical rainforests

    Daniel Donato with the Forest Service of the U.S. Department of Agriculture and his colleagues surveyed tree mass, dead wood, and soil carbon in 25 mangrove ecosystems around the tropical Indian and Pacific Oceans.

    A mangrove landscape on the Ganges River Delta, Bangladesh. Mangroves are being rapidly deforested globally.
    A mangrove landscape on the Ganges River Delta, Bangladesh. Mangroves are being rapidly deforested globally.

    Donato says study shows, "They are right up there with the most carbon-rich forests in the world."

    Donato's results showed mangroves store about three to four times more carbon per hectare as temperate forests or even tropical rainforests. But Donato says most of it is hidden.

    "Carbon in mangroves is really about the below-ground story," he says. "Most of the carbon stored in that ecosystem is in the soil and the tree roots."

    Mangroves stored about five times as much carbon in deep soils compared to temperate or tropical forests.

    Rapid loss

    But the researchers note that a third to a half of the world's mangroves have been cut down in the last half-century for timber, coastal development and aquaculture.

    The researchers estimate that the amount of greenhouse gases released each year from mangrove deforestation may be equivalent to as much as 10 percent of the global toll from deforestation.That's despite the fact that mangroves make up less than 1 percent of the tropical forest area.

    Donato says the research should get the attention of policymakers."It shows mangroves are probably pretty good candidates for things like carbon-market trading to encourage sustainable forest management."

    Dollar value

    Carbon markets, where industries buy the right to emit carbon dioxide in exchange for protecting forests or other offsets, could be a powerful force for conservation, environmentalists say.

    Many developing countries, especially in Asia, are clearing mangroves for fish and shrimp aquaculture because it can be profitable. The value of the mangrove often is not immediately obvious to policymakers, says Emily Pidgeon, director the marine climate change program at the environmental group Conservation International.

    "By suddenly having an actual mechanism to value these systems in dollars, it gives you a potentially very large new mechanism for countering the other financial and economic arguments," she says.

    Consumer standards

    Other groups are approaching the economics of mangrove conservation from the buyer's side. They are encouraging Western supermarkets and other large consumers to only buy farmed seafood that meets certain standards, including limited impact on mangrove loss.

    Pidgeon says it works well in some places. But other developing countries are not equipped to meet or enforce the standards.

    "The government structures are not very strong," she says, "and the expertise and capacity to apply some of these approaches is often very challenging."

    Mosaic of services

    One of the most important ways to help local communities value the mangroves, Pidgeon says, is to see them as part of a mosaic that provides a whole range of services, including nurturing the fisheries that many developing-world coastal fishing communities depend on for their livelihoods.

    "Although you may catch your fish in one particular piece of the mosaic, the fish are only there to catch because of the time they spend in all the other pieces," she adds.

    For many coastal communities, carbon storage is just the latest service they may see mangroves providing.

    You May Like

    Mother of IS Supporter: Son Was Peaceful, 'Role Model'

    Somali-American Abdirizak Mohamed Warsame pleaded guilty Thursday to charges of conspiring to provide material support to Islamic State militants

    Factions Shift as Civilians Die in Syrian War

    Scenario likely only to further confuse military situation on ground and potentially worsen humanitarian crisis that already has grown to epic proportions

    Presidential Hopefuls Woo Minorities, Evangelicals

    Four GOP candidates to speak at forum at Bob Jones University in Greenville, South Carolina

    This forum has been closed.
    Comments
         
    There are no comments in this forum. Be first and add one

    Featured Videos

    Your JavaScript is turned off or you have an old version of Adobe's Flash Player. Get the latest Flash player.
    Two-thirds of World Faces Water Shortagei
    X
    February 12, 2016 7:31 PM
    Four billion people — or two out of every three on the planet — do not have enough water to meet their basic needs. That is far greater than previously thought, according to a new study that presents a more accurate picture of the problem. As VOA's Rosanne Skirble reports, the findings will help policymakers and the public craft solutions to address the threat.
    Video

    Video Two-thirds of World Faces Water Shortage

    Four billion people — or two out of every three on the planet — do not have enough water to meet their basic needs. That is far greater than previously thought, according to a new study that presents a more accurate picture of the problem. As VOA's Rosanne Skirble reports, the findings will help policymakers and the public craft solutions to address the threat.
    Video

    Video Gateway to Mecca: Historical Old Jeddah

    Local leader Sami Nawar's family has been in the Old City of Jeddah for hundreds of years and takes us on a tour of this ancient route to Mecca, also believed to be the final resting place of Adam's wife, Eve.
    Video

    Video New Technology Aims to Bring Election Transparency to Uganda

    A team of recent graduates from Uganda’s Makerere University has created a mobile application designed to help monitor elections and expose possible rigging. The developers say the app, called E-Poll, will make Uganda's democratic process fairer. From Kampala, VOA's Serginho Roosblad reports.
    Video

    Video As Refugees Perish, Greek Graveyards Fill

    Aid workers on the Greek island of Lesbos say they are struggling to bury the increasing number of bodies of refugees that have been recovered or washed up ashore in recent months.  The graveyards are all full, they say, yet as tens of thousands of people clamor to get out of Syria, it is clear refugees will still be coming in record numbers. For VOA, Hamada Elrasam reports from Lesbos, Greece.
    Video

    Video Russia Bristles at NATO Expansion in E. Europe

    Russian Foreign Minister Sergei Lavrov is meeting Friday with the head of NATO after the Western military alliance and the United States announced plans for the biggest military build-up in Europe since the Cold War. Russia has called NATO's moves a threat to stability in Europe. But NATO says the troop rotations and equipment are aimed at reassuring allies concerned about Russia as VOA's Daniel Schearf reports from Moscow.
    Video

    Video To Fight Zika, Scientists Target Mosquitoes

    Mosquitoes strike again. The Zika virus outbreak is just the latest headline-grabbing epidemic carried by these biting pests, but researchers are fighting back with new ways to control them. VOA's Steve Baragona takes a look.
    Video

    Video Mosul Refugees Talk About Life Under IS

    A top U.S. intelligence official told Congress this week that a planned Iraqi-led operation to re-take the city of Mosul from Islamic State militants is unlikely to take place this year. IS took over the city in June 2014, and for the past year and a half, Mosul residents have been held captive under its rule. VOA's Zana Omar talked to some families who managed to escape. Bronwyn Benito narrates his report.
    Video

    Video Scientists Make Progress Toward Better Diabetes Treatment, Cure

    Scientists at two of the top U.S. universities say they have made significant advances in their quest to find a more efficient treatment for diabetes and eventually a cure. According to the International Diabetes Federation, the disease affects more than 370 million people worldwide. VOA’s George Putic reports.
    Video

    Video NATO to Target Migrant Smugglers

    NATO has announced plans to send warships to the Aegean Sea to target migrant smugglers in the alliance's most direct intervention so far since a wave of people began trying to reach European shores.
    Video

    Video Russia's Catholics, Orthodox Hopeful on Historic Pope-Patriarch Meeting

    Russia's Catholic minority has welcomed an historic first meeting Friday in Cuba between the Pope and the Patriarch of Russia's dominant Orthodox Church. The Orthodox Church split with Rome in 1054 and analysts say politics, both church and state, have been driving the relationship in the centuries since. VOA's Daniel Schearf reports from Moscow.
    Video

    Video Used Books Get a New Life on the Streets of Lagos

    Used booksellers are importing books from abroad and selling them on the streets of Africa's largest city. What‘s popular with readers may surprise you. Chris Stein reports from Lagos.
    Video

    Video After NH Primaries All Eyes on South Carolina

    After Tuesday's primary in New Hampshire, US presidential candidates swiftly turned to the next election coming up in South Carolina. The so-called “first-in-the-South” poll may help further narrow down the field of candidates. Zlatica Hoke reports.
    Video

    Video Smartphone Helps Grow Vegetables

    One day, you may be using your smartphone to grow your vegetables. A Taipei-based company has developed a farm cube — a small, enclosed ecosystem designed to grow plants indoors. The environment inside is automatically adjusted by the cube, but it can also be controlled through an app. VOA's Deborah Block has more on the gardening system.
    Video

    Video Exhibit Turns da Vinci’s Drawings Into Real Objects

    In addition to being a successful artist, Renaissance genius Leonardo da Vinci designed many practical machines, some of which are still in use today, although in different forms. But a number of his projects were never realized — until today. VOA’s George Putic reports.