AMC foundation ocean conservation 2025

Sand is far more than something we walk on at the beach. It is a critical natural resource that directly supports marine ecosystems. Sand forms coastlines, builds habitats, filters water, and protects shore communities from storm surge and erosion.

When natural sand breaks down, the process normally takes thousands of years through weathering of rocks, shells, and coral. However, human activity has dramatically changed this cycle. Sand fragmentation—the accelerated breakdown of sand into smaller particles, including micro-sand and microplastics—occurs due to:

• Overdevelopment and excessive sand mining

• Coastal construction projects

• Boat traffic and wave-energy disruption

• Plastic waste degrading into sand-sized particles

As grains become smaller and lighter, beaches become more vulnerable. The coast loses its ability to buffer waves, reefs become smothered by sediment, and species that depend on sand—like sea turtles and shoreline vegetation—struggle to survive.

Sand is now the second-most extracted natural resource in the world after water, and many regions are facing severe shortages. Protecting sand means protecting marine life, water quality, tourism economies, and entire coastal cultures.

Even miles away from the ocean, what happens on land eventually finds its way to the sea. Soil mismanagement, construction runoff, and plastic pollution all flow downstream and contribute to sand fragmentation along our coasts.

What “big vessels” do to the ocean — key impacts and why they matter

• Underwater noise pollution

• Large ships generate continuous, low-frequency noise (from engines, hull vibration, propellers, cavitation) — often 140–195 decibels under water. 

• Because sound travels farther and faster in water than in air, this noise spreads over large distances and can mask natural sounds that marine animals depend on. 

• For species that rely on sound — whales, dolphins, other marine mammals, even many fish — this interferes with communication, navigation, hunting, mating, predator detection and other vital behaviours. 

• Over time, chronic noise can lead to stress, changes in behaviour (avoidance of noisy areas), reduced reproductive success or even physical hearing damage. 

• Physical harm: vessel strikes and collisions

• Ships can collide with marine animals — especially large marine mammals like whales — causing injury or death. 

• Because many large marine species spend most of their time underwater and only surface briefly, even experienced vessel operators can miss them. 

• These collisions are a documented and serious threat to endangered and vulnerable species. 

• Habitat destruction and seabed damage

• Anchoring, mooring, or grounding of large ships can physically destroy sensitive seabed habitats — such as coral reefs, seagrass beds, and bottom-dwelling communities — which can take decades or centuries to form. 

• Even without grounding, the turbulence from propellers and wake can stir up sediments, increasing water turbidity. This reduces light penetration (disrupting photosynthesis in seagrass and algae), suffocates bottom-dwelling species, and degrades water quality. 

• In coastal or shallow ecosystems — often crucial nurseries or breeding grounds — these disturbances are especially damaging. 

• Pollution — chemical, waste, and introduction of invasive species

• Ships routinely discharge wastewater (greywater, sewage), bilge water, oily residues, and other waste. Even regulated discharges can degrade water quality, introduce toxins, alter nutrient levels, and harm marine organisms. 

• Operational discharges and accidental spills (e.g., oil spills) pose serious hazards to marine life, with potential long-term ecosystem damage. 

• Ships often take on ballast water in one region and release it elsewhere. This can inadvertently introduce non-native (invasive) species — from microbes to larger organisms — into new ecosystems, where they may outcompete native species and disrupt local ecological balance. 

• Contributing to broader environmental stress — climate, acidification, cumulative stressors

• Vessel emissions (from engines, fuel burning) contribute to greenhouse gases and atmospheric pollution. This contributes to broader ocean stressors like global warming, sea-level rise, ocean acidification — which in turn harm coral reefs, shell-forming organisms, and entire ecosystems. 

• The combination of noise, pollution, physical disturbance, and habitat loss — especially in areas with heavy vessel traffic — can push ecosystems toward tipping points, reducing resilience, biodiversity, and ecosystem services.

Why this matters — implications for marine conservation & why your inland-to-ocean experience is relevant

• Even though big vessels operate far offshore, their impacts reach deeply into ecosystems: from deep-sea to coastal nurseries, from large whales to tiny organisms.

• Many of the species and habitats disrupted — whales, dolphins, coral reefs, seagrass meadows — are key to ocean health, biodiversity, and resilience. Once damaged, recovery can take decades or may never fully happen.

• Pollution and invasive species problems mean that actions and events “far away” can still cascade — affecting food webs, coral reef health, fish populations, and human livelihoods tied to fisheries and tourism.

• For marine conservation efforts (like yours): addressing vessel impacts is not optional — it’s a major front in protecting ocean health.

What determines water clarity vs murkiness

• Suspended particles (sediment, silt, clay, organic material, algae) — These block or scatter light as it passes through water.

• Low nutrient / low plankton or algal density — Fewer microscopic organisms means fewer particles in the water to absorb or scatter light.

• Sandy or coarse, stable seabed & low sediment runoff — If the bottom is made of heavier sand or coral-derived sand (rather than fine silt/clay), particles settle quickly instead of remaining suspended in the water column.

• Less freshwater / river-sediment input or dilution from rivers/estuaries — Rivers bring silt, clay, soil and organic material from inland which clouds water. Coastal zones near big rivers or estuaries often have more turbid water.

Why many South-American / tropical coastal waters (or those “crystal-clear” seas) tend to look clearer

• Many tropical/coastal regions that appear “crystal clear” have sandy or coral-derived bottoms, with coarse/non-easily suspending sediments (like calcium-carbonate sands) rather than fine silt/clay. That means less light scattering.

• They often have relatively low nutrient and plankton levels compared with more temperate, estuarine, or runoff-impacted coasts — so fewer microscopic organisms to cloud the water.

• Coral reefs, seagrass beds, and calm, shallow waters often help keep sediments settled rather than stirred up — helping water stay clear.

Why coastal waters near Savannah / Georgia Coast tend to be more murky / less “clear”

• The coast around Savannah and Georgia has many estuaries, sounds, salt-marshes, tidal creeks and rivers feeding into the ocean — from big rivers like the Savannah River and other inland waterways. Freshwater input brings sediments, soil, and organic material that keep waters turbid.

• The coastline is geologically and hydrodynamically active: strong tides and currents move sediments around, keeping fine particles suspended rather than letting them settle.

• Land-based activities (agriculture, development, runoff, soil erosion) upstream increase sediment and nutrient runoff — which raise turbidity and reduce clarity in coastal waters.

• The seabed and marsh/estuary systems are naturally more silty or muddy — these finer sediments tend to stay suspended in the water longer, scattering light and making the water appear darker, browner, or “murky.”

What this means — “Clear water” is not always a sign of purity or health; it’s often a mix of geology, ecology & geography

• Clear water often indicates low suspended sediment / fewer particles, less runoff, stable seabed — which helps light penetrate deep and makes colors vivid.

• Murky or turbid water may often result from river input, estuaries, marshes, sediment resuspension, human runoff — and while not always “dirty,” these waters reflect the complex interaction of land and sea typical of coastal ecosystems like Georgia’s.

• For conservation work, it matters: suspended sediments, runoff, nutrient loads influence habitat health for seagrass, marshes, reefs, marine life — especially species sensitive to light, oxygen, or water-quality changes.

AMC Foundation — 2025 Ocean Conservation Report Conclusion

This year, our inland learning trip gave us a deeper understanding of how the ocean sustains both nature and humanity. We studied sand fragmentation, which is accelerating due to coastal development and human activity — causing beaches to erode faster, harming ecosystems, and disrupting species that rely on stable shorelines.

We learned how large ocean vessels — through underwater noise, ship strikes, seabed disturbance, waste discharge, and invasive species spread — are major sources of stress to whales, marine mammals, and fragile ocean habitats. These impacts interfere with communication, migration, reproduction, and water quality across vast ocean regions.

We also saw how the ocean is a lifeline for global prosperity: billions depend on seafood for daily nutrition, and hundreds of millions rely on marine industries for employment — particularly in poorer coastal communities where alternatives are limited. The ocean further stabilizes Earth’s climate, protects coastlines, and supports economies through fishing, tourism, and global trade.

Finally, we understood why some waters — like those along parts of South America — look crystal clear, while waters near Savannah, Georgia appear brown or murky. Clear tropical waters often have low sediment and fewer suspended particles, while Georgia’s estuaries and tidal marshes bring in fine sediments and organic matter from rivers, naturally reducing visibility.