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Sewage Threatens Marine Life, Says Un


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Sewage is a growing threat to oceans and seas, putting at risk marine life and habitats as the pollution problem escalates, the United Nations Environment Program (UNEP) says in a new report.

The State of the Marine Environment report found that substantial progress had been achieved in reducing oily wastes and organic pollutants such as long-lived industrial chemicals in the past two decades, but other problems had grown worse.

In many developing countries, between 80 and nearly 90 per cent of sewage entering the coastal zones is estimated to be raw and untreated, said the report compiled by the UNEP global program of action for protection of marine environment (GPA).

"The pollution - linked with rising coastal populations, inadequate treatment infrastructure and waste handling facilities - is putting at risk human health and wildlife as well as livelihoods from fisheries to tourism," it said.

The report estimated that an additional $US56 billion ($A75.5 billion) is needed annually to address the global sewage problem.

There is also a rising concern over the increasing damage and destruction of essential and economically important coastal ecosystems like mangrove forests - needed for coastal defences and fisheries, as well as coral reefs and seagrass beds.

Growing coastal populations and overuse of marine resources are the main source of the problem, the UNEP said. Close to 40 per cent of the world's population live on the coastal fringe.

Threatened areas include the North Sea's bed, coral reefs in South East Asia, wetlands in North America, Southern and Western Africa, mangroves in many Caribbean countries, Ecuador and Colombia, and fisheries in Latin America.

The report also noted increasing levels of pollutants from sources like agricultural fertiliser, manure, sewage and fossil fuel burning, with the problem spreading from developed to developing countries as well.

This has led to doubling of the number of oxygen deficient coastal "dead zones" every decade since 1960, and degradation of seagrass beds and emergence of toxic algal blooms.

The UNEP highlighted progress made in reducing global oil and chemicals pollution. The world has cut oil discharges from industry and cities by nearly 90 per cent since the mid-1980s.

But concerns of further oil pollution remain as climate change and the loss of ice is opening up the North East passage across the roof of the world to shipping and oil exploration.

The findings will be given to over 60 member governments of the GPA initiative at a meeting in Beijing from October 16 to 20 to encourage a review of their planning and investment strategies to ensure they are genuinely marine-friendly, the UNEP said.

"An estimated 80 per cent of marine pollution originates from the land and this could rise significantly by 2050 if, as expected, coastal populations double in just over 40 years time and action to combat pollution is not accelerated, UNEP executive director Achim Steiner said.

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