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A prosperous blue economy in coastal areas requires operational models that clearly link ecological outcomes to economic returns. These models can support investment, planning, and the growth of non-extractive economies that benefit both coastal communities and the environment. Here, we focus on an Essential Ocean Variable—fish biomass—because it is a globally standardized and monitored variable with proven links to recovery and management. We connect this variable to a key economic output: scuba diving ecotourism, which is a critical component of many coastal economies.

Coral reefs face catastrophic collapse. Thermal tipping points for widespread, irreversible dieback have already been passed at 1.2–1.4°C of global warming. The ocean is already 30% more acidic since the Industrial Revolution began, weakening coral reefs growth – akin to the osteoporosis of the sea.

Unless we reduce global emissions at extraordinary speed and scale mass restoration with thermal resistant coral resilient to increasingly acidic waters – the future is dire: at 1.5°C, we lose 70-90% of reefs; at 2°C: 99% destruction. 

Target 3 of the Convention on Biological Diversity’s (CBD) Kunming-Montreal Global Biodiversity Framework calls for the protection of 30% of terrestrial areas, inland waters, and marine and coastal areas through area-based conservation (protected areas and other effective conservation measures) by 2030. As we progress toward this target, there is a need to critically evaluate the potential impacts of marine area-based measures on small-scale fishing communities, whose well-being is intrinsically entwined with marine ecosystems.

Ocean sustainability demands interdisciplinary knowledge. While interdisciplinary collaborations involving the natural sciences are common, few have also included the ocean humanities despite the entanglement of human culture and history with the ocean. We
a team of both ocean scientists and humanities researchers outline a framework for integrating these disciplines. We show how

Ocean warming is increasing the frequency, extent, and severity of tropical-coral bleaching and mortality. During 2014–2017, marine heatwaves caused the Third Global Coral Bleaching Event. We analyze data from 15,066 reef surveys globally during 2014–2017. Across all surveyed reefs, 80% and 35% experienced moderate or greater (affecting >10% of corals) bleaching and mortality, respectively.

Tropical forests enhance regional rainfall but a robust analysis of this benefit is lacking. Consequently, the rainfall generating services of tropical forests are rarely accounted for in policymaking. We synthesised observational and model-based values of the reduction in rainfall due to tropical deforestation to quantify rainfall generation. Across these studies, we estimate that each meter squared of forest contributes 240 ± 60 L each year to regional rainfall. The Amazon forest has an even stronger rainfall benefit, with each meter squared of forest contributing 300 ± 110 L each year.

For decades, a dominant argument for protecting forests has focused on carbon. Trees absorb carbon dioxide, store it in wood and soils, and slow the accumulation of greenhouse gases. A new scientific review suggests this emphasis overlooks other ways forests shape climate and human well-being. Forests, it argues, are not only a mitigation tool for the future climate. They also help people adapt to climate change today, shaping temperature, water and human well-being in ways that are felt locally.

Meeting the ambitious targets set by the Convention on Biological Diversity (CBD) Kunming-Montreal Global Biodiversity Framework (GBF) will require expanding ecosystem restoration across governance domains for marine and coastal ecosystems. Marine spatial planning (MSP), which balances the development of multiple human uses in the ocean with the preservation of ecosystem health, might be the most effective vehicle for achieving this aim. However, to date, MSP and restoration efforts have proceeded on separate tracks, and biodiversity loss continues.

Since 2023, the Palau International Coral Reef Center (PICRC) has been collaborating with the Koror State Government (KSG) to conduct research and monitoring aimed at providing essential baseline data to guide the Koror Southern Lagoon Coastal Fisheries Management Plan, a new fisheries management initiative for Koror State. The management plan identified several fish spawning aggregation sites for protection, including the longnose emperor (melangmud, Lethrinus olivaceus) at Mutiaur.