Marine biodiversity and ecosystems underpin a healthy planet and social well-being.

Author:Palmer, Cristiana Pasca
 
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In no other realm is the importance of biodiversity for sustainable development more essential than in the ocean. Marine biodiversity, the variety of life in the ocean and seas, is a critical aspect of all three pillars of sustainable development--economic, social and environmental--supporting the healthy functioning of the planet and providing services that underpin the health, wellbeing and prosperity of humanity.

The ocean is one of the main repositories of the world's biodiversity. It constitutes over 90 per cent of the habitable space on the planet and contains some 250,000 known species, with many more remaining to be discovered--at least two thirds of the world's marine species are still unidentified. (1)

The ocean, and the life therein, are critical to the healthy functioning of the planet, supplying half of the oxygen we breathe (2) and absorbing annually about 26 per cent of the anthropogenic carbon dioxide emitted into the atmosphere. (3)

Evidence continues to emerge demonstrating the essential role of marine biodiversity in underpinning a healthy planet and social well-being. The fishery and aquaculture sectors are a source of income for hundreds of millions of people, especially in low-income families, and contribute directly and indirectly to their food security. Marine ecosystems provide innumerable services for coastal communities around the world. For example, mangrove ecosystems are an important source of food for more than 210 million people, (4) but they also deliver a range of other services, such as livelihoods, clean water, forest products, and protection against erosion and extreme weather events.

Not surprisingly, given the resources that the ocean provides, human settlements have developed near the coast: 38 per cent of the world's population lives within 100 km of the coast, 44 per cent within 150 km, 50 per cent within 200 km, and 67 per cent within 400 km. (5) Roughly 61 per cent of the world's total gross domestic product comes from the ocean and the coastal areas within 100 km of the coastline. (6) Coastal population densities are 2.6 times larger than in inland areas and benefit directly and indirectly from the goods and services of coastal and marine ecosystems, which contribute to poverty eradication, sustained economic growth, food security and sustainable livelihoods and inclusive work, while hosting large biodiversity richness and mitigating the impacts of climate change. (7)

Thus, pressures that adversely impact marine biodiversity also undermine and compromise the healthy functioning of the planet and its ability to provide the services that we need to survive and thrive. Moreover, as demands on the ocean continue to rise, the continued...

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