Coral Reefs Provide Flood Protection Worth $1.8 Billion Annually — Another Key Reason to Protect Them
By Michael Beck
The news is grim: According to a report compiled by hundreds of scientists from 50 countries, Earth is losing species faster than at any other time in human history. Thanks to climate change, coastal development and the impacts of activities such as logging, farming and fishing, roughly 1 million plants and animals are facing extinction.
The UN report calls for rapid action at every level, from local to global, to conserve nature and use it sustainably. And here's some potential good news: Many ecosystems now at risk can provide valuable services if they are protected.
I know from my research on coastal habitats that the biggest obstacle to investing in natural infrastructure, such as wetlands and reefs, often is that experts have not figured out how to value the protection that these habitats provide in economic terms. But a new report that I co-authored, published by the U.S. Geological Survey, solves that problem for one of our planet's most biodiverse ecosystems: coral reefs.
This report shows that coral reefs in U.S. waters, from Florida and the Caribbean to Hawaii and Guam, provide our country with more than $1.8 billion dollars in flood protection benefits every year. They reduce direct flood damages to public and private property worth more than $800 million annually, and help avert other costs to lives and livelihoods worth an additional $1 billion. Rigorously valuing reef benefits in this way is the first step toward mobilizing resources to protect them.
Breaking Waves and Blocking Floods
Reefs act just like submerged breakwaters. They "break" waves and drain away their energy offshore, before it floods coastal properties and communities. This is an enormously valuable function. In 2017, tropical storms alone did over $265 billion in damage across the nation.
Manmade defenses, such as sea walls, can damage adjoining habitats and harm species that rely on them. In contrast, healthy reefs enhance their surroundings by protecting shorelines and supporting fisheries and recreation, from diving to surfing.
The flood protection benefits that reefs provide across the U.S. are similar to those in more than 60 other nations. As I estimated with colleagues in a separate study, the global cost of storm damage to the world's coastlines would double without reefs.
Pinpointing Local Flood Protection Value
Our estimate of the value of flood protection from reefs applies state-of-the-art tools that engineers and insurers use to assess flood risks and benefits.
Using a model and more than 60 years of hourly wave data for all U.S. states and territories with reefs — a total area of over 1,900 miles — we developed flood risk maps projecting the extent and depth of flooding that would occur across many storms, both regular and catastrophic, with reefs present and then without them. We calculated these values in grid cells that measured just 100 square meters, or about 1,000 square feet — the footprint of a small house.
Then we overlaid these flood risk maps on the latest information from the U.S. Census Bureau and the Federal Emergency Management Agency to identify people and properties at risk — and benefiting from the presence of reefs — in each location.
Map showing the 100-year floodplains on south Maui, Hawai'i. They show the flooding in a 1 in 100 year flood event with reefs at present (blue) and the extra flooding predicted (red) if we lost the topmost 1m (3 ft) of reef. The people and property under the red zone are those predicted to benefit by keeping reefs intact. USGS
With this level of detail, we now can identify not just total benefits provided by reefs, but who receives them. For example, Florida receives more than $675 million in annual flood protection from reefs, and Puerto Rico gets $183 million in protection yearly. In Honolulu alone, we found that reefs provide more than $435 million in protection from a catastrophic 1-in-50-year storm — an event large enough that it would be expected to occur only once in a 50-year period.
It is well known that coral reefs are under heavy stress from climate change, which is warming oceans, causing coral bleaching. Pollution and overfishing are also doing serious damage. As the UN report on biodiversity loss notes, Earth has lost approximately half of its live coral reef cover since the 1870s. And that trend leaves 100-300 million people in coastal areas at increased risk due to loss of coastal habitat protection.
Investing in Natural Defenses
How can our valuation study inform coral reef protection?
First, it buttresses the case for using disaster recovery funding to help natural coastal defenses recover. After Hurricane Sandy in 2012, only about 1% of recovery funding went toward rebuilding natural resilience, despite subsequent research showing that marshes in the Northeast can reduce flood damages by some 16% annually.
More than $100 billion has been appropriated to recover from hurricanes Harvey, Maria and Irma; it would make economic sense to spend some of these funds on rebuilding reefs. In a promising move, the Federal Emergency Management Agency has created opportunities to include ecosystem services such as flood protection and fishery production in official benefit to cost analysis calculations to support flood mitigation funding.
Second, the insurance industry has an important role to play in offering incentives and supporting investments in nature-based defenses for risk reduction. Insurers are starting to consider habitats in industry risk models and to create opportunities to insure nature. Thus reefs could be re-built if they are damaged in storms or even restored now based on their proven flood protection (i.e., premium saving) benefits.
Third, federal agencies have incentives to invest in reefs as protection for critical infrastructure. Reefs defend military bases located along tropical coastlines, as well as shore-hugging roads that are the lifeblood of many economies from Hawaii to Florida and Puerto Rico.
Through its Engineering With Nature initiative, the Army Corps of Engineers is making more use of natural solutions to minimize flood risks. And the U.S. Department of Transportation is analyzing ways to protect coastal highways with nature-based solutions, such as marsh restoration. These programs are a start in the right direction.
The new UN report clearly identifies key threats to species and ecosystems. Our work provides rigorous social and economic values quantifying what is at stake. My co-authors and I hope it creates new incentives to invest in coral reef conservation and restoration and to build coastal resilience.
Bleaching Has Struck the Southernmost Coral Reef in the World https://t.co/G2MTaSRuFA— EcoWatch (@EcoWatch) April 4, 2019
Michael Beck is a research professor at the University of California, Santa Cruz.
Disclosure statement: Michael Beck receives funding from the World Bank, German International Climate Initiative, U.S. Department of the Interior, Kingfisher Foundation, the U.S. Federal Emergency Management Agency and The Nature Conservancy.
Reposted with permission from our media associate The Conversation.
EcoWatch Daily Newsletter
A herdsman in the Chinese autonomous region of Inner Mongolia was diagnosed with the bubonic plague Sunday, The New York Times reported.
- Plagues Follow Bad Leadership in Ancient Greek Tales - EcoWatch ›
- Black Death Is Back! Two Cases of Plague Confirmed in China ... ›
By Matt Kasson, Brian Lovett and Carolee Bull
Home gardening is having a boom year across the U.S. Whether they're growing their own food in response to pandemic shortages or just looking for a diversion, numerous aspiring gardeners have constructed their first raised beds, and seeds are flying off suppliers' shelves. Now that gardens are largely planted, much of the work for the next several months revolves around keeping them healthy.
Start With Prevention<p>Just as preventive steps like maintaining a balanced diet help keep humans healthy, home growers can take many actions to help their gardens thrive.</p><p>One key step is assessing soil fertility – the ability of soil to sustain plant growth – which can vary widely depending on your location and soil type. Low soil fertility limits food production and predisposes plants to disease and pests. University extension <a href="https://soiltesting.wvu.edu/" target="_blank">soil testing labs</a> can help evaluate the quality of garden soil and identify nutrient deficiencies and acidic soils, often at no charge.</p>
Using weed barrier landscape cloth for planting rows and mulching between rows is an effective way to suppress weeds. Matt Kasson, CC BY-ND
Diagnosing Problems<p>Common plant pathogens include <a href="https://www.apsnet.org/edcenter/disandpath/viral/introduction/Pages/PlantViruses.aspx" target="_blank">viruses</a>, <a href="https://www.apsnet.org/edcenter/disandpath/prokaryote/intro/Pages/Bacteria.aspx" target="_blank">bacteria</a>, <a href="https://www.apsnet.org/edcenter/disandpath/nematode/intro/Pages/IntroNematodes.aspx" target="_blank">nematodes</a>, <a href="https://www.apsnet.org/edcenter/disandpath/oomycete/introduction/Pages/IntroOomycetes.aspx#:%7E:text=The%20oomycetes%2C%20also%20known%20as,foliar%20blights%20and%20downy%20mildews." target="_blank">oomycetes</a> and <a href="https://www.apsnet.org/edcenter/disandpath/fungalasco/intro/Pages/IntroFungi.aspx" target="_blank">fungi</a>. All of these microorganisms, especially at an early stage of infection, are too small to see. But when they proliferate, they cause changes in plants that we can recognize.</p><p>Unlike insects, which move around on six legs or on wings through the air, pathogens can move unseen and unchecked from leaf to leaf on the wind, through the soil or in droplets of water. Some microbes have even formed intimate relationships with insects and use them as vehicles to move from plant to plant, which makes these pathogens even more challenging to manage. Unfortunately, by the time some pathogens make their presence known, the damage is already done.</p><p>We recently conducted a <a href="https://twitter.com/kasson_wvu/status/1265989041725624323" target="_blank">Twitter poll</a> of gardeners nationwide to find out which culprits plagued their gardens. People named <a href="https://ento.psu.edu/extension/factsheets/aphids" target="_blank">aphids</a>, <a href="https://ento.psu.edu/extension/factsheets/squash-vine-borer" target="_blank">squash vine borers</a>, <a href="https://ento.psu.edu/extension/factsheets/squash-bug" target="_blank">squash bugs</a> and <a href="https://ento.psu.edu/extension/factsheets/flea-beetle" target="_blank">flea beetles</a> as the most problematic insect pests. Their most troublesome pathogens included <a href="https://extension.wvu.edu/lawn-gardening-pests/plant-disease/fruit-vegetable-diseases/powdery-mildew" target="_blank">powdery mildew</a>, <a href="https://plantpath.ifas.ufl.edu/rsol/Trainingmodules/BWTomato_Module.html" target="_blank">tomato bacterial wilt</a> and <a href="https://extension.wvu.edu/lawn-gardening-pests/plant-disease/fruit-vegetable-diseases/downy-mildew" target="_blank">cucurbit downy mildew</a>.</p><p>To manage such perennial challenges, the first step is to spend time closely looking at your plants. Do you notice any insects consistently hanging around, or molds colonizing leaves or other plant parts? How about symptoms such as blight, stunting, or leaves that are yellowing, browning or wilting?</p>
This white fungal growth is an early sign of powdery mildew on a leaf of susceptible summer squash. Matt Kasson, CC BY-ND
- 5 Ways to Make Your Garden Regenerative - EcoWatch ›
- How to Make your House and Garden More Tranquil - EcoWatch ›
- Gardening in Hard Times Has Deep History - EcoWatch ›
By Emma Charlton
The effects of climate change may more far-reaching than you think.
Hotter temperatures have been linked to a rise in energy poverty, with more people struggling to meet their energy bills from their household income, according to a new study published on ScienceDirect by researchers from Italy's Ca' Foscari University.
Value of air conditioning imports in selected OECD countries. ScienceDirect
The ‘Golden Thread’<p>The <a href="https://www.endenergypoverty.org/reports" target="_blank">Global Commission to End Energy Poverty</a> calls access to energy the "golden thread" that weaves together economic growth, human development, and environmental sustainability. And one of the <a href="https://www.weforum.org/agenda/archive/sdg-07-affordable-and-clean-energy" target="_blank">United Nations' Sustainable Development Goals</a> is to ensure access to affordable, reliable, sustainable and modern energy for all by 2030.</p><p>Sustainability also has a large role to play in the future of energy and failing to embed green policies in COVID-19 stimulus packages and underinvesting in green infrastructure are current risks, according to the <a href="http://www3.weforum.org/docs/WEF_COVID_19_Risks_Outlook_Special_Edition_Pages.pdf" target="_blank">World Economic Forum</a>.</p><p>In its vision for a 'Great Reset' – building a better world after the pandemic – the Forum and the IMF jointly backed the <a href="https://www.weforum.org/agenda/2020/06/end-fossil-fuel-subsidies-economy-imf-georgieva-great-reset-climate/" target="_blank">transition to a green economy</a> and called for an end to fossil fuel subsidies.</p>
As if the surging cases of coronavirus weren't enough for Floridians to handle, now the state's Department of Health (DOH) has confirmed that a person in the Tampa area tested positive for a rare brain-eating amoeba, according to CBS News. The Florida DOH posted a warning to residents to remind them of the dangers of the rare single-celled amoeba that attacks brain tissue.
Scientists are urging the WHO to revisit their coronavirus guidance to focus more on airborne transmission and less on hand sanitizer and hygiene. John Lund / Photodisc / Getty Images
The World Health Organization (WHO) is holding the line on its stance that the respiratory droplets of the coronavirus fall quickly to the floor and are not infectious. Now, a group of 239 scientists is challenging that assertion, arguing that the virus is lingering in the air of indoor environments, infecting people nearby, as The New York Times reported.
- Summer Heat Won't Kill the Coronavirus, New Study Says - EcoWatch ›
- Here's Why COVID-19 Can Spread So Easily at Gyms and Fitness ... ›
- Is the New Coronavirus Airborne? A Study From China Finds Evidence ›
Along the northern shores of the Gulf of Mexico, oysters live in coastal estuaries where saltwater and freshwater meet and mix.
- Hurricanes, Water Wars Threaten New High-End Oyster Industry on ... ›
- 'Dead Zone' Predicted for Gulf of Mexico ›
- The Gulf Oyster Situation Is Very Bad, But There's Hope - EcoWatch ›
Scores of people remained stranded in southern Japan on Sunday after heavy rain the day before caused deep flooding and mudslides that left at least 34 people confirmed or presumed dead.
Care Home Inundated<p>Altogether 16 residents at an elderly care home in Kuma Village are presumed dead after the facility was flooded by water and mud.</p><p>Fifty-one other residents have been rescued by boats and taken to hospitals for treatment, officials said.</p><p>Eighteen other people elsewhere have been confirmed dead, while more than a dozen others were still missing as of Sunday afternoon.</p><p>The Fire and Disaster Management Agency said many others were still waiting to be rescued from other inundated areas.</p><p>Hitoyoshi City was also badly affected by flooding, as rains in the prefecture exceeded 100 millimeters (4 inches) per hour at their height.</p>
More Rain Forecast<p>The disaster in the Kumamoto prefecture on Kyushu island is the worst natural catastrophe since Typhoon Hagibis in October last year, which cost the lives of 90 people.</p><p>Although residents in Kumamoto prefecture were advised to evacuate their homes following the downpours on Friday evening into Saturday, many people chose not to leave for fear of contracting the coronavirus.</p><p>Officials say, however, that measures are in place at shelters to prevent the transmission of the disease.</p><p>More rain is predicted in the region, and the Japan Meteorological Agency has warned of the danger of further mudslides.</p>
- 900,000 Forced to Evacuate Due to Flooding in Japan - EcoWatch ›
- Typhoon Slams Into Flood-Ravaged Japan - EcoWatch ›
- Historic Floods in Japan Kill More Than 100, Force Millions to Flee ... ›