The impact of sea level rise – don’t say you weren’t warned

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12s4.4771525 10 10 10 10-4.4771525 10-10S17.5228475 2 12 2z"> </path> </svg> </button> </form> </div> <div class="content"> <main class="main rows-gap margin-top-1 margin-bottom-1"> <nav aria-label="breadcrumbs" class="rank-math-breadcrumb"><p><a href="https://cosmosmagazine.com">Cosmos</a><span class="separator"> » </span><a href="/earth/climate/">Climate</a></p></nav> <section class="article-container cols-4 md-cols-1 cols-gap-1 padding-bottom-4"> <article class="col col-span-3 post-288871 post type-post status-publish format-standard has-post-thumbnail hentry category-climate category-earth category-my-cosmos category-news tag-mangroves tag-sea-level-rise"> <header class="rows rows-gap"> <h1 class="entry-title row">The impact of sea level rise – don’t say you weren’t warned</h1> <div class="row primary-image has-featured-image " data-featured-image="NC-Duke-with-the-2017-2019-NESP-Australian-National-Environmental-Science-Program-project.jpg"> <img width="1200" height="675" src="data:image/svg+xml;base64,PHN2ZyB4bWxucz0iaHR0cDovL3d3dy53My5vcmcvMjAwMC9zdmciIHZpZXdCb3g9IjAgMCAxMjAwIDY3NSIgd2lkdGg9IjEyMDAiIGhlaWdodD0iNjc1IiBkYXRhLXU9IiUyRndwLWNvbnRlbnQlMkZ1cGxvYWRzJTJGMjAyMyUyRjExJTJGTkMtRHVrZS13aXRoLXRoZS0yMDE3LTIwMTktTkVTUC1BdXN0cmFsaWFuLU5hdGlvbmFsLUVudmlyb25tZW50YWwtU2NpZW5jZS1Qcm9ncmFtLXByb2plY3QuanBnIiBkYXRhLXc9IjEyMDAiIGRhdGEtaD0iNjc1IiBkYXRhLWJpcD0iIj48L3N2Zz4=" data-spai="1" class="feature-image wp caption" alt="Mangroves" decoding="async" loading="eager" fetchpriority="high" /><noscript data-spai="1"><img width="1200" height="675" src="https://cdn.shortpixel.ai/spai/q_lossy+ret_img+to_auto/cosmosmagazine.com/wp-content/uploads/2023/11/NC-Duke-with-the-2017-2019-NESP-Australian-National-Environmental-Science-Program-project.jpg" data-spai-egr="1" class="feature-image wp caption" alt="Mangroves" decoding="async" loading="eager" fetchpriority="high" srcset="https://cdn.shortpixel.ai/spai/q_lossy+ret_img+to_auto/cosmosmagazine.com/wp-content/uploads/2023/11/NC-Duke-with-the-2017-2019-NESP-Australian-National-Environmental-Science-Program-project.jpg 1200w, https://cdn.shortpixel.ai/spai/q_lossy+ret_img+to_auto/cosmosmagazine.com/wp-content/uploads/2023/11/NC-Duke-with-the-2017-2019-NESP-Australian-National-Environmental-Science-Program-project-600x338.jpg 600w, https://cdn.shortpixel.ai/spai/q_lossy+ret_img+to_auto/cosmosmagazine.com/wp-content/uploads/2023/11/NC-Duke-with-the-2017-2019-NESP-Australian-National-Environmental-Science-Program-project-768x432.jpg 768w, https://cdn.shortpixel.ai/spai/q_lossy+ret_img+to_auto/cosmosmagazine.com/wp-content/uploads/2023/11/NC-Duke-with-the-2017-2019-NESP-Australian-National-Environmental-Science-Program-project-300x169.jpg 300w" sizes="(max-width: 1200px) 100vw, 1200px" /></noscript> <div class="caption feature">Credit: NC Duke with the 2017-2019 NESP Australian National Environmental Science Program project.</div> </div> </header> <div class="entry-content cols-6 md-cols-1 cols-gap-1 margin-top-1"> <div class="content-left-sidebar cols-1 col"> <section class="contributors md-cols-1 rows-gap"> <div class="row post-date"> <span class="published-date">November 24, 2023</span> </div> <a href="https://cosmosmagazine.com/contributor/richard-musgrove/" class="author row md-hide"> <img src="data:image/svg+xml;base64,PHN2ZyB4bWxucz0iaHR0cDovL3d3dy53My5vcmcvMjAwMC9zdmciIHZpZXdCb3g9IjAgMCAxMDgwIDEwODAiIHdpZHRoPSIxMDgwIiBoZWlnaHQ9IjEwODAiIGRhdGEtdT0iJTJGd3AtY29udGVudCUyRnVwbG9hZHMlMkYyMDIzJTJGMDclMkZSaWNoYXJkLU11c2dvdmUtbmV3LmpwZyIgZGF0YS13PSIxMDgwIiBkYXRhLWg9IjEwODAiIGRhdGEtYmlwPSIiPjwvc3ZnPg==" data-spai="1" alt="Richard Musgrove" width="200" /><noscript data-spai="1"><img src="https://cdn.shortpixel.ai/spai/q_lossy+ret_img+to_auto/cosmosmagazine.com/wp-content/uploads/2023/07/Richard-Musgove-new.jpg" data-spai-egr="1" alt="Richard Musgrove" width="200" /></noscript> <div class="bio"> <h3>Richard Musgrove</h3> </div> </a> <div id="author-name" class="hide"> <a href="https://cosmosmagazine.com/contributor/richard-musgrove/" class="bio"> By Richard Musgrove </a> </div> <div class="favourite__wrapper row cols"> <button class="showDialog simplefavorite-button" aria-label="Favourite button"> </button> </div> </section> </div> <div class="primary-content cols-1 col-span-5 col"> <div class="flexible-content "> <div class="copy"> <p class="has-drop-cap">Sea level rise, due to climate change, is inexorable and accelerating, but regional impacts are sometimes difficult to separate from seasonal trends. </p> <p>A new report has estimated the impacts of rising seas on coral reefs, tidal marshes and mangroves around the world  – ecosystems on which millions of people depend for their livelihoods and safety.</p> <p>Dr Hirotada Moki and colleagues of the Coastal and Estuarine Environment Group at Japan’s Port and Airport Research Institute (PARI) estimated the marine losses by the year 2100, in a paper just published in the <a href="https://doi.org/10.1371/journal.pclm.0000298" target="_blank" rel="noopener">open-access journal <em>PLOS Climate</em></a>.</p> <p><em>Cosmos</em> spoke to Moki via video conference.</p> <p>Moki and his team forecast the catastrophic loss of up to three-quarters of our global coral habitat, including the Great Barrier Reef. And blue carbon sinks such as tidal marshes and mangroves could shrink by about 92% and 74% percent respectively.</p> <p>What do we lose?</p> <div class="advert ad-in-content ad-mobile auh-250"><div id="adn-00000000001fc2ca-i0p0" style="display: none"></div></div> <p>Coastal habitats are critical to carbon storage and climate mitigation. The <a href="https://www.iucn.org/sites/default/files/2022-07/blue_carbon_issues_brief.pdf" target="_blank" rel="noreferrer noopener">International Union for the Conservation of Nature</a> says 83% of global carbon circulates through the oceans with about half of that sequestered in coastal habitats, a mere 2% of the total ocean area. These and seagrass meadows are important ‘blue carbon’ stores – <a href="https://oceanservice.noaa.gov/facts/bluecarbon.html" target="_blank" rel="noopener">carbon locked up in coastal and marine habitats</a>.</p> <p>Most carbon (green carbon) stored in a forest tree is lost to the atmosphere when that tree dies, but in coastal ecosystems, dead plant material, and terrestrial detritus, often get buried – <a href="https://cosmosmagazine.com/nature/mangrove-forest-carbon-sequestration/" target="_blank" rel="noreferrer noopener">potentially storing the carbon for thousands of years</a>. <a href="https://www.nature.com/articles/ngeo1123" target="_blank" rel="noreferrer noopener">Mangroves, for example, may store 3-5 times</a> as much carbon as other tropical forests.  Because these ecosystems are <a href="https://climate.mit.edu/explainers/coastal-ecosystems-and-climate-change" target="_blank" rel="noopener">important carbon sinks</a>, their loss is an important driver of climate change<a href="https://climate.mit.edu/explainers/coastal-ecosystems-and-climate-change" target="_blank" rel="noopener">,</a> says the Massachusetts Institute of Technology (MIT). </p> <p>Coral reefs <a href="https://www.globalcoral.org/_oldgcra/reefs%20are%20not%20a%20carbon%20sink.htm" target="_blank" rel="noreferrer noopener">are not blue carbon stores,</a> as carbon dioxide is released in the making of their limestone (calcium carbonate) skeletons, but “they contribute an astonishing $34 billion annually to the global economy, despite only covering 0.2% of the seafloor”, says Dr Manuel Gonzalez-Rivero from the Australian Institute of Marine Science.</p> <p><a href="https://www.un.org/en/climatechange/science/climate-issues/ocean" target="_blank" rel="noreferrer noopener">United Nations Climate Action</a> says coral reefs support more than 25% of the globe’s marine biodiversity and provide about a billion people with coastal protection, fisheries, sources of medicine, recreation and tourism.</p> <p>“Losing reef habitats can mean entire countries become uninhabitable due to saltwater intrusion, flooding, and lack of food resources,” says Gonzalez-Rivero, “in addition to loss of non-quantifiable values including culture and identity.”</p> <div class="advert ad-in-content ad-mobile auh-250"><div id="adn-00000000001fc2ca-i1p0" style="display: none"></div></div> <p>Unfortunately, conservation of such ecosystems often clashes with the priorities of <a href="https://www.un.org/esa/sustdev/natlinfo/indicators/methodology_sheets/oceans_seas_coasts/pop_coastal_areas.pdf" target="_blank" rel="noreferrer noopener">40% of the</a> global population (<a href="https://soe.dcceew.gov.au/coasts/pressures/population" target="_blank" rel="noreferrer noopener">87% in Australia</a>) living within 50km of the coast.</p> <h2 class="wp-block-heading">Which path?</h2> <p>Moki and his PARI researchers used topographic data and an MIT climate model to predict how such shallow water ecosystems might look out to 2100, using data including projected sea level rises, water temperatures, and photosynthesis and sedimentation rates.</p> <p>Climate change effects on tidal marsh, mangrove, seagrass meadow, macroalgal bed, and coral reef areas were estimated, using two hypothetical scenarios, called “<a href="https://coastadapt.com.au/sites/default/files/infographics/15-117-NCCARFINFOGRAPHICS-01-UPLOADED-WEB%2827Feb%29.pdf" target="_blank" rel="noreferrer noopener">representative concentration pathways</a>” (RCPs), for the present day, the 2050s and the 2090s.</p> <blockquote class="wp-block-quote has-text-align-left is-style-default"> <p>Losing reef habitats can mean entire countries become uninhabitable due to saltwater intrusion</p> <cite>Dr Manuel Gonzalez-Rivero</cite></blockquote> <p>The two RCPs represented the best and the worst possible outcomes. The best, RCP2.6, includes all the sensible strategies that the scientific community have been recommending for years – major efforts to curb emissions, 100% renewables, carbon capture, use of electric vehicles, <a href="https://cosmosmagazine.com/climate-solution/easy-street-how-do-we-make-walking-and-cycling-to-school-number-one/" data-type="post" data-id="288797">bicycles</a> and public transport.</p> <p>For this scenario, the projection is 1<sup>o</sup>C global temperature rise by 2100 over pre-industrial levels (we are approaching 1.5<sup>o</sup>C), and small increases in sea level (0.4m) and extreme weather.</p> <a href="https://link.cosmosmagazine.com/OP59" class="newsletter-cta" data-device="mobile"> <img decoding="async" src="data:image/svg+xml;base64,PHN2ZyB4bWxucz0iaHR0cDovL3d3dy53My5vcmcvMjAwMC9zdmciIHZpZXdCb3g9IjAgMCAzMDAgMjUwIiB3aWR0aD0iMzAwIiBoZWlnaHQ9IjI1MCIgZGF0YS11PSIlMkZ3cC1jb250ZW50JTJGdXBsb2FkcyUyRjIwMjQlMkYwMyUyRldlZWtseS1DYXRjaHVwLTMwMHgyNTAtMS5wbmciIGRhdGEtdz0iMzAwIiBkYXRhLWg9IjI1MCIgZGF0YS1iaXA9IiI+PC9zdmc+" data-spai="1" alt="Newsletter" title="the impact of sea level rise – don’t say you weren’t warned 1"><noscript data-spai="1"><img decoding="async" src="https://cdn.shortpixel.ai/spai/q_lossy+ret_img+to_auto/cosmosmagazine.com/wp-content/uploads/2024/03/Weekly-Catchup-300x250-1.png" data-spai-egr="1" alt="Newsletter" title="the impact of sea level rise – don’t say you weren’t warned 1"></noscript> </a><div class="advert ad-in-content ad-mobile auh-250"><div id="adn-00000000001fc2ca-i2p0" style="display: none"></div></div> <p>The worst outcome – RCP8.5 – predicts increases in sea level by 0.6m and in global temperature by about 3.7<sup>o</sup>C, almost double the critical threshold, 2<sup>o</sup>C, at which NASA says, <a href="https://climate.nasa.gov/news/3278/nasa-study-reveals-compounding-climate-risks-at-two-degrees-of-warming/" target="_blank" rel="noopener">“dangerous and cascading effects of human-generated climate change will occur.”</a></p> <h2 class="wp-block-heading">Shrinking our carbon sinks and coral reef livelihoods</h2> <p>The authors say that global coral habitat could shrink by up to 74% by 2100 under RCP8.5 and 25% under RCP2.6.</p> <div class="in-content-area related-box-wrapper content-third content-right margin-bottom-1"> <div class="gradient-title">Read More</div> <ul class="related-box article-listing"> <li class="cols"> <div class="article article-post"> <a href="https://cosmosmagazine.com/nature/mangrove-forest-carbon-sequestration/" class="thumbnail ar-16-9" aria-label="Article link"> <span data-spai-bg-on="1" class="image" style="background-image: url(data:image/svg+xml;base64,PHN2ZyB4bWxucz0iaHR0cDovL3d3dy53My5vcmcvMjAwMC9zdmciIHZpZXdCb3g9IjAgMCAxMjAwIDY3NSIgd2lkdGg9IjEyMDAiIGhlaWdodD0iNjc1IiBkYXRhLXU9Imh0dHBzJTNBJTJGJTJGY29zbW9zbWFnYXppbmUuY29tJTJGd3AtY29udGVudCUyRnVwbG9hZHMlMkYyMDIyJTJGMDklMkYxMjAwLU1UQy1FbnRlcmluZy1CQ1MtTWFuZ3JvdmVzLWNyZWRpdC1SYW1pcm8tQXJjb3MtQWd1aWxhcjQyLWNvcHkuanBnIiBkYXRhLXc9IjEyMDAiIGRhdGEtaD0iNjc1IiBkYXRhLWJpcD0iIj48L3N2Zz4=)"></span> </a> <div class="article-content has-very-light-grey-background-color"> <a href="/nature/"> <span class="category nature-color"> Nature </span> </a> <a href="https://cosmosmagazine.com/nature/mangrove-forest-carbon-sequestration/"> <h3>Mangroves keep carbon in the soil for 5,000 years</h3> </a> </div> </div> </li> </ul> </div> <p>But Moki says it could be worse as the model did not include data on potential <a href="https://www.climate.gov/news-features/featured-images/no-safe-haven-coral-combined-impacts-warming-and-ocean-acidification" target="_blank" rel="noreferrer noopener">effects of ocean acidification on marine organisms, including corals</a>.</p> <p>“Models, are imperfect by default”, says Gonzalez-Rivero. “<a href="https://www.pnas.org/doi/10.1073/pnas.2015265118" target="_blank" rel="noreferrer noopener">Ocean acidification is already affecting the capacity of coral reefs</a> to recover and adapt to other impacts from climate change, such as rising sea levels, therefore exacerbating the effects of ocean warming.”</p> <p>Under RCP8.5, tidal marshes and mangroves were also predicted to shrink by 91.9% and 74.3% respectively by 2100, assuming coastal development and land use prevented their migration inland with sea level rise.<strong>  </strong>Shallow water ecosystem (SWE) survival, as sea levels rise, is a matter of appropriate coastal management, Moki concluded, which should include prevention of unnecessary development and a compromise between man-made infrastructure and SWE conservation to mitigate coastal erosion.</p> <div class="advert ad-in-content ad-mobile auh-250"><div id="adn-00000000001fc2ca-i3p0" style="display: none"></div></div> <h2 class="wp-block-heading">Sea level rise is now</h2> <p>The end of the century may be 76 years away but sea-level rise impacts are very real, right now, in many parts of our region.</p> <p>The US National Oceanic and Atmospheric Administration says the global average sea level has risen by 21-24 cm since 1880, largely due to a combination of increased meltwater from glaciers and ice sheets and thermal expansion of water as it warms. Half of this rise has happened since 1970, says CSIRO, and the rate is accelerating – the 2022 global average sea level was at 10.1 cm above 1993 levels, the highest since satellite records began. Sea level rise on the east coast of Australia is close to the global average, at 2-4mm/year, but that in the north of the country is much higher, at 4-6mm/year. </p> <p>“Local communities and First Nation peoples will likely see the impacts of coral reef degradation much earlier [than 2100] due to the reliance on the ecological services coral reefs provide,” says Gonzalez-Rivero. For Tuvalu, rising seas are an existential threat to this nation of 11,900 people, on 9 reef islands and atolls, midway between Australia and Hawaii. Perhaps fated to be the first nation to witness their home islands disappear beneath the waves due to climate change, Tuvaluans are currently <a href="https://unfccc.int/resource/docs/napa/tuv01.pdf" target="_blank" rel="noopener">battling coastal</a> erosion, saltwater intrusion and increasing disease outbreaks caused by sea level rise.</p> <blockquote class="wp-block-quote has-text-align-left is-style-default"> <p>For Tuvalu, rising seas are an existential threat to this nation of 11,900 people</p> </blockquote> <p>Australia’s critical northern coastal ecosystems are also under real threat, says Dr Norman Duke of TropWATER at James Cook University in Cairns, with “upper tidal wetlands (mangroves and saltmarshes) already responding to sea level rise”.</p> <p>“So, when I think of future changes, I think of these in terms of the even greater acceleration of already changing shoreline ecosystems,” Duke adds.</p> <div class="advert ad-in-content ad-mobile auh-250"><div id="adn-00000000001fc2ca-i4p0" style="display: none"></div></div> <p>Northern Australian mangroves inhabit a semi-arid environment and are sensitive to changes in sea levels during <a href="https://cosmosmagazine.com/earth/enso-iod-weather-patterns-explainer/">ENSO</a> events. <a href="https://www.cmar.csiro.au/sealevel/sl_hist_last_decades.html" target="_blank" rel="noopener">Reduced sea levels</a> brought about by El Niño events and made more extreme by climate change effects have already killed mangroves, says Duke. Localised sea level reductions – effectively extreme droughts – in tidal ecosystems caused catastrophic <a href="https://journals.plos.org/climate/article?id=10.1371/journal.pclm.0000037" target="_blank" rel="noreferrer noopener">mass dieback of mangroves</a> in 1982 and 2015, across swathes of Northern Australia, he adds.  </p> <p>Brief, but intense sea level falls were also noted for Northern Australia, on closer examination of the climate model, says Moki. The effects of ENSO will be incorporated in future predictions, he adds.  </p> <p>Damage caused to mangroves by severe tropical cyclones has also increased tenfold in the last decade, says Duke. And the number and severity of these cyclones have reached unprecedented levels over the same period, compared with those from at least 1970. “Impacts and responses are active, dynamic and current,” he adds.</p> <p>“This study brings a critical perspective to help drive prompt and targeted action, centred on reducing greenhouse emissions,” concludes Gonzalez-Rivero.</p>  <img id="cosmos-post-tracker" width='1' height='1' style="opacity:0; height:1px!important; width:1px!important; border: 0!important; position: absolute!important; z-index: -1!important;" aria-label="Syndication Tracker" src="https://syndication.cosmosmagazine.com/?id=288871&title=The+impact+of+sea+level+rise+%E2%80%93+don%E2%80%99t+say+you+weren%E2%80%99t+warned" loading="lazy">  <div class="share-syndicate-wrapper margin-top-1"> <div id="cosmos-link-back">  <p>Originally published by <a href="https://cosmosmagazine.com" style="font-style:italic;">Cosmos</a> as <a title="The impact of sea level rise – don’t say you 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The impact of sea level rise – don’t say you weren’t warned