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Currently, negotiation on global carbon emissions reduction is very difficult owing to lack of international willingness. In response, geoengineering (climate engineering) strategies are proposed to artificially cool the planet. Meanwhile, as the harbor around one-third of all described marine species, coral reefs are the most sensitive ecosystem on the planet to climate change. However, until now, there is no quantitative assessment on the impacts of geoengineering on coral reefs. This study aims to model the impacts of stratospheric aerosol geoengineering on coral reefs.

The HadGEM2-ES climate model is used to model and evaluate the impacts of stratospheric aerosol geoengineering on coral reefs.

This study shows that (1) stratospheric aerosol geoengineering could significantly mitigate future coral bleaching throughout the Caribbean Sea; (2) Changes in downward solar irradiation, sea level rise and sea surface temperature caused by geoengineering implementation should have very little impacts on coral reefs; (3) Although geoengineering would prolong the return period of future hurricanes, this may still be too short to ensure coral recruitment and survival after hurricane damage.

This is the first time internationally to quantitatively assess the impacts of geoengineering on coral reefs.

Diving has become a popular tourism activity for professionals and novices. Coral reefs or other types of natural sources are still the most preferred diving sites. However, they are under threat for many reasons, for example, climate change, intensive human activities or commercial use. Many countries have promoted artificial reefs to protect coral reefs and create new attractions for tourists. These new underwater atmospheres have changed diving and diving experiences. Wrecks, vessels, monuments, hotels, sunken cities or other types of artificial reef forms invite divers to discover and explore the human-driven underwater environment with novelty seeking, photographic opportunities and mysterious surroundings. This atmospheric turn has brought many advantages to communities, stakeholders and nations with socio-economic benefits, advantages in sustainability management and destination image. This chapter examines the range of underwater atmospheres in different structures and countries and explores their potential benefits.

The purpose of this paper is to prove and qualify the influence of textured surface substrates morphology and chemical composition on the growth and propagation of transplanted corals. Use additive manufacturing and silicone moulds for converting three-dimensional samples into limestone mortar with white Portland cement substrates for coral growth.

Tiles samples were designed and printed with different geometries and textures inspired by nature marine environment. Commercial coral frag tiles were analysed through scanning electron microscopy (SEM) to identify the main chemical elements. Raw materials and coral species were selected. New base substrates were manufactured and deployed into a closed-circuit aquarium to monitor the coral weekly evolution process and analyse the results obtained.

Experimental results provided positive statistical parameters for future implementation tests, concluding that the intensity of textured surface, interfered favourably in the coralline algae biofilm growth. The chemical composition and design of the substrates were determinant factors for successful coral propagation. Recesses and cavities mimic the natural rocks aspect and promoted the presence and interaction of other species that favour the richness of the ecosystem.

Additive manufacturing provided an innovative method of production for ecology restoration areas, allowing rapid prototyping of substrates with high complexity morphologies, a critical and fundamental attribute to guarantee coral growth and Crustose Coralline Algae. The result of this study showed the feasibility of this approach using three-dimensional printing technologies.

Sri Lanka is an island described as a “pearl” situated between latitudes 5.55° 9.51′ N and longitude 79.41° 81.54′ E in the Indian Ocean. It has a coastline of 1,585km (Coast Conservation Department [CCD], 1986a, 1986b). From the coastline, the exclusive economic zone (EEZ) extends 200 nautical miles. This is 6.7 times the country's land area, occupying 437,400km². Coastal waters extend from the continental shelf to the other limits of the EEZ. The coastal area forms a dynamic interface of land and water and is of special significance in the country's economical, ecological, and social fabric. Thus, a “coastal zone” has been defined where activities are regulated by the government (Coast Conservation Act of Sri Lanka [CCD], 1981). Sri Lanka's coastal zone is defined in the Coast Conservation Act as the area lying within a limit of 300m landward of the mean high waterline and, in the case of rivers, streams, lagoons, or any other body of water connected to the sea, either permanently or periodically, the landward boundary shall extend to a limit of 2km perpendicular to the strait baseline drawn between the natural entrance points thereof and shall include waters of such water bodies.

The purpose of this paper is to highlight how data from marine protected area (MPA) surveys can be used to facilitate the development of systematic approaches to monitoring biodiversity within local government development plans and across marine bioregions.

The study focussed on coastal Barangays of the Municipality of San Luis, Aurora Philippines. A Participatory Coastal Resource Assessment (PCRA) was conducted to gather information on corals and reef fishery resources. Resultant Simpson’s biodiversity indices were calculated and compared to other MPA sites. Linkages to enhanced marine curriculum in a San Luis high school were evaluated by utilizing cultural consensus theory (CCT) on previously reported local student perception surveys as a further effort on defining pathways for localized transformation.

San Luis MPA biodiversity indices ranged from 0.56-0.8 on a scale of 0-1. This initial analysis demonstrates how local monitoring can be connected to resource assessment through biodiversity considerations and in developing local plans for site improvement linked to local economies. Results are used to demonstrate the potential for further development of an integrated approach to biodiversity monitoring across and between bioregions as a step forward in strengthening science for MPAs and biodiversity conservation for the Philippines.

The study could be used to pilot study strengthening of coastal resource management (CRM) at Municipal and Barangay levels and as well through application of CCT to the topics. The results will be used to reinforce the formulation of San Luis local development plans to better consider marine resource assessment.

This paper provides a new perspective on the use of quantitative measures of biodiversity to assist with local development plans. Projecting integrated biodiversity monitoring across and between bioregions is considered as a potential tool for facilitating climate change mitigation.

This paper aims to reduce the cost, limit the time and increase raw material source availability, coral aggregate seawater concrete (CASC) composed of coral, coral sand, seawater and cement can be widely used for the construction of ports, levees, airports and roads to achieve practical engineering values. However, the naturally porous coral structure and abundant Cl⁻ in the seawater and coral lead to extremely severe reinforcement corrosion for CASC. It is well known that Cl⁻ is the main cause of reinforcement corrosion in the marine environment. Therefore, it is necessary to research the reinforcement corrosion of CASC in the marine environment.

In this study, linear polarization resistance was adopted to test the linear polarization curves of reinforcement in CASC with different exposure times. E_corr, R_p, I_corr and V_corr were calculated according to the weak electrochemical polarization theory and Stern–Geary formula. The effects of concrete cover thickness, exposure time, reinforcement types and inhibitor on reinforcement corrosion in CASC were analysed. The reinforcement corrosion degradation rule was determined, which provided theoretical support for the durability improvement, security assessment, service life prediction and service quality control of CASC structures in marine islands and reef engineering.

The corrosion resistance was enhanced with increased concrete cover thickness, and the concrete cover thickness for organic new coated steel should be at least 5.5 cm to reduce the reinforcement corrosion risks in CASC structures. The corrosion resistance of different types of reinforcements followed the rule: 2205 duplex stainless steel > 316 stainless steel > organic new coated steel > zinc-chromium coated steel > common steel. In the early exposure stage, the anti-corrosion effectiveness of the calcium nitrate inhibitor (CN) was superior to that for the amino alcohol inhibitor (AA). With the extension of exposure time, the decreasing rate of anticorrosion effectiveness of CN was higher than that of AA.

Reinforcement corrosion of CASC in a marine environment was studied. Concrete cover thickness, exposure time, reinforcement type and inhibitor influenced the reinforcement corrosion were investigated. New technique of reinforcement anti-corrosion in marine engineering was proposed. Possible applications of CASC in marine engineering structures were suggested.

Tourism is a rapidly growing economic sector that contributes significantly to national and local economies globally. Tourism growth in any destination largely depends on the weather and climate, considered prime factors affecting global tourist flows. Global South countries are said to be particularly vulnerable to climate change, owing to their limited adaptation capacity, placing them at greater risk of the impacts of climate change. This adaptive capacity is mainly attributed to a lack of capital intensity and technological flexibility, which is less effective than in developed countries. In addition to a lack of capacity to adjust to the direct hazards of climate change, developing countries are at additional risk due to their heavy reliance on economic sectors and resources sensitive to climate change, such as tourism. An enhanced understanding of climate change's impacts and adaptations to climate change is critical for determining strategic actions for tourism planning and development. This chapter provides a theoretical review of tourism and adaptation strategies, challenges and the dimensions of vulnerability in a tourism context, as well as the implications of climate change on tourism planning in the future. This chapter discusses the impact of climate change on tourism in the Global South, examining case studies and policy frameworks for adaptation and mitigation. It further explores opportunities for sustainable tourism development and partnerships for climate-resilient tourism. Overall, the chapter focuses on the challenges and opportunities for sustainable tourism in the Global South in the face of climate change.

The purpose of this chapter is to address the issue of climate change and its effects on developing insular countries like the Maldives in order to identify adaptive mechanisms and new opportunities in the international context towards achieving sustainable development, taking into account its environmental and social incidences.

Firstly, the chapter introduces some generalities of the Republic of the Maldives and its current challenges. Next, there is a description of the economy of the islands: here the importance of its major source of income, the tourism industry, is highlighted. Then, vulnerabilities and adaptive mechanisms are explored for the particular case of tourism.

Maldivian current efforts in disaster risk management (DRM) mitigation, preparedness, response, and reconstruction stages, and the work between government, private organizations, and civil society, implemented since the 2004 tsunami; and as a response to climate change, are examples of how to apply collaborative approaches proposed by Sustainable Development Objectives, COP21 agreement, and Sendai Framework.

It is difficult to measure the consequences of sustainable development actions by the Maldivian government, especially in the international environment.

The study of the Maldivian DRM strategy in the context of climate change and the lessons from the Maldives’ tourism sector development under climate action serves as a model for other international business organizations which aim to reach sustainable development standards in the Post-2015 Development Agenda.

This chapter evaluated important opportunities for sustainable development agenda that can be learned from DRM measures in Maldives.