Human impacts on oceans nearly doubled in recent decade: Study

In the recent decade, the total human impacts on the world's oceans have nearly doubled and could double again in the next decade without adequate action, suggests researchers.

A study published in the journal 'Scientific Reports,' assessed for the first time where the combined impacts that humans are having on oceans, from nutrient pollution to overfishing, are changing and how quickly. In nearly 60 per cent of the ocean, the cumulative impacts are increasing significantly and, in many places, at a pace that appears to be accelerating.

"That creates even more urgency to solve these problems," said lead author Ben Halpern, director of NCEAS and a professor at UC Santa Barbara's Bren School of Environmental Science & Management.

Climate change is a key factor driving the increase across the world, as seas warm, acidify and rise. On top of that, commercial fishing, runoff from land-based pollution and shipping are intensifying progressively each year in many areas of the ocean.

"It's a multifactor problem that we need to solve. We can't just fix one thing if we want to slow and eventually stop the rate of increase in cumulative impacts," said Halpern.

The study also projected the impacts one decade into the future, based on the rate of change in the recent past, finding that they could double again if the pace of change continues unchecked.

The assessment provides a holistic perspective of where and how much human activities shape ocean change, which is essential to policy and planning.

"If you don't pay attention to the big picture, you miss the actual story. The bigger picture is critical if you want to make smart management decision, where are you going to get your biggest bang for your buck," said Halpern.

Regions of particular concern include Australia, Western Africa, the Eastern Caribbean islands and the Middle East, among others. Coastal habitats such as mangroves, coral reefs and seagrasses are among the hardest-hit ecosystems.

There is an upside to the story, however. The authors did find "success stories" around every continent, areas where impacts have declined, such as the seas of South Korea, Japan, the United Kingdom and Denmark, all of which have seen significant decreases in commercial fishing and pollution.

These declines suggested that policies and other actions to improve ocean conditions are making a difference although the analysis does not attribute specific actions to those declines.

"We can improve things. The solutions are known and within our grasp. We just need the social and political will to take action," said Halpern.