Coral Reefs are Critical for Risk Reduction & Adaptation
New study shows that coral reefs provide risk reduction benefits to hundreds of millions of coastal inhabitants around the world
ARLINGTON, Va — Stronger storms, rising seas, and flooding are placing hundreds of millions people at risk around the world, and big part of the solution to decrease those risks is just off shore. A new study in “Nature Communications” finds that coral reefs reduce the wave energy that would otherwise impact coastlines by 97 percent.
“Coral reefs serve as an effective first line of defense to incoming waves, storms and rising seas,” said Dr. Michael Beck, lead marine scientist of The Nature Conservancy and a co-author of the study, “200 million people across more than 80 nations are at risk if coral reefs are not protected and restored.”
Published today in the journal “Nature Communications,” this study by an international team of researchers from the University of Bologna, The Nature Conservancy, U. S. Geological Survey, Stanford University and University of California – Santa Cruz, provides the first global synthesis of the contributions of coral reefs to risk reduction and adaptation across the Atlantic, Pacific, and Indian Oceans.
“This study illustrates that the restoration and conservation of coral reefs is an important and cost effective solution to reduce risks from coastal hazards and climate change,” said Dr. Filippo Ferrario, lead author from the University of Bologna.
Key results from the study:
- Coral reefs provide substantial protection against natural hazards by reducing wave energy by an average of 97 percent (studies across all tropical oceans).
- The reef crest, or shallowest part of the reef where the waves break first, dissipates 86 percent of wave energy on its own.
- The median cost for building artificial breakwaters is USD $19,791 per meter, compared to $1,290 per meter for coral reef restoration projects.
"Coral reefs are wonderful natural features that, when healthy, can provide comparable wave reduction benefits to many artificial coastal defenses and adapt to sea-level rise” said Dr. Curt Storlazzi a co-author from USGS. “This research shows that coral reef restoration can be a cost-effective way to decrease the hazards coastal communities face due to the combination of storms and sea-level rise."
“While there are many concerns about the future of corals reefs in the face of climate change,” Dr. Fiorenza Micheli of Stanford University said, “there are still many reasons for optimism about the future of coral reefs particularly if we manage other local stressors such as pollution and development.”
The study found that there are 197 million people worldwide who can receive risk reduction benefits from coral reefs alone or may have to bear higher costs of disasters if the reefs are degraded. These are people in villages, towns, and cities who live in low, risk prone coastal areas (below 10m elevation) and within 50 km of coral reefs.
Conservation efforts are most often directed to more remote reefs, however the study suggests there should also be a focus on reefs closer to the people who will directly benefit from reef restoration and management. In terms of number of people who receive risk reduction benefits from coral reefs, the top 15 countries include:
1. Indonesia, 41 million
2. India, 36 million
3. Philippines, 23 million
4. China, 16 million
5. Vietnam, 9 million
6. Brazil, 8 million
7. United States, 7 million
8. Malaysia, 5 million
9. Sri Lanka, 4 million
10. Taiwan, 3 million
11. Singapore, 3 million
12. Cuba, 3 million
13. Hong Kong, 2 million
14. Tanzania, 2 million
15. Saudi Arabia, 2 million
Additionally, major investments are being made in artificial defense structures such as seawalls for coastal hazard mitigation and climate adaptation. The study shows that the restoration of coral reefs for coastal defense may be as low as 1/10 the cost of building artificial breakwaters. Reef defenses can be enhanced in a cost-effective manner through restoration, a key factor in protecting small island nations and regions with limited fiscal resources.
World Risk Report 2012
Environmental degradation is a significant factor that reduces the capacity of societies to deal with disaster risk in many countries around the world. This is the key message of the World Risk Report 2012, presented October 11th in Brussels, Belgium by the German Alliance for Development Works (Alliance), United Nations University Institute for Environment and Human Security (UNU-EHS) and The Nature Conservancy.
The World Risk Report examines who is at risk from natural disasters, what contributes to this risk and what can be done about it. The record for the decade 2002 to 2011 is alarming: 4,130 disasters, more than a million deaths and an economic loss of at least 1.195 trillion dollars.
The centerpiece of the report, the WorldRiskIndex, developed by UNU-EHS in cooperation with the Alliance, determines the risk of becoming the victim of a disaster as a result of natural hazards for 173 countries throughout the world.
The Nature Conservancy was a core partner on this year’s report, because of its focus on the linkages between environmental degradation and disaster risk.
“This report illustrates the powerful role that nature can play in reducing risks to people and property from coastal hazards like storms, erosion and floods. Coral reefs, oyster reefs and mangroves offer flexible, cost-effective, and sustainable first lines of defense, as well as other benefits like healthy fisheries and tourism that sea walls and breakwaters will never provide," said Dr. Michael Beck, Lead Marine Scientist at The Nature Conservancy. .
To help communities around the world understand who is at risk and who may be helped by natural solutions, we have made relevant maps and data from the World Risk Report available online through our Coastal Resilience network mapping application.