Loss of coastal lagoons

Destruction of coastal wetlands

Nature

Loss of coastal lagoons refers to the degradation, reduction, or complete disappearance of shallow, brackish water bodies separated from the ocean by barriers such as sandbars or reefs. This environmental problem is driven by urbanization, pollution, land reclamation, and climate change, leading to habitat destruction, loss of biodiversity, and diminished ecosystem services. Coastal lagoons serve as critical nurseries for marine life, natural water filters, and buffers against storms. Their loss threatens fisheries, water quality, and coastal protection, impacting both human communities and wildlife. Addressing this issue requires integrated management and conservation efforts.

Background

The loss of coastal lagoons emerged as a recognized global concern in the late 20th century, as rapid urbanization, land reclamation, and pollution led to the disappearance or severe degradation of these unique ecosystems. International scientific attention intensified following reports of declining biodiversity and fisheries, particularly in the Mediterranean, Southeast Asia, and the Americas, prompting cross-border research initiatives and policy discussions on the ecological and socio-economic consequences of lagoon loss.

Incidence

Once, much of the Nile delta was composed of marshes and brackish lagoons, protected from the sea by sand bars. Today the lagoons have been reduced by drainage, and are increasingly polluted by sewage and pesticides. Lake Maryut, once a haven for wildlife depicted in Lawrence Durrell's Alexandria Quartet, is now a cesspit for the metropolis of Alexandria. It is a very rare rare when Nile waters are allowed to pass naturally through the lagoons into the sea. Fish catches there dropped by 85% in the 1970s. The sewers of Cairo, a city of 10 million people, empty into the equally foetid Manzala lagoon. The four surviving lagoons supply 100,000 tonnes of fish annually (two-thirds of Egypt's catch) and employ 100,000 people. But these may soon disappear with the sea erosion of the protective sandbars which are deprived of silt since the Aswan dam was built in 1964.

Claim

The loss of coastal lagoons is a critical environmental crisis that demands urgent attention. These unique ecosystems are irreplaceable nurseries for marine life, natural flood barriers, and vital filters for pollutants. Their destruction accelerates biodiversity loss, endangers coastal communities, and worsens climate change impacts. Ignoring this issue is reckless and short-sighted—protecting coastal lagoons must be a top global priority if we care at all about our planet’s future and our own survival.

Counter-claim

The so-called “loss of coastal lagoons” is vastly overstated and hardly a pressing issue. Compared to urgent global challenges like poverty, disease, or energy shortages, the disappearance of a few lagoons is trivial. Nature constantly changes landscapes, and human progress should not be hindered by sentimental attachment to every patch of water. Resources and attention are better spent on problems that genuinely impact human well-being, not on preserving every coastal feature.