Humanity’s impact on global oceans nearly doubled in a just over a decade and could double again soon without urgent and sweeping international action, warns a study published Monday in the journal Scientific Reports.

“We can improve things. The solutions are known and within our grasp. We just need the social and political will to take action.”
—Ben Halpern, study lead author

To determine the pace of change in cumulative human impacts on the world’s oceans, researchers from University of California, Santa Barbara and Stanford University combined annual data from 2003 to 2013 on 14 human stressors and how they affected 21 marine ecosystems.

The team found that over the 11 years, 59 percent of the ocean experienced a significant increase in cumulative impact, “in particular due to climate change but also from fishing, land-based pollution, and shipping.” Human impact significantly decreased for only five percent of the ocean.

“Impacts of human activities on the ocean have been shown to be substantial, ubiquitous, and changing,” the study says, pointing to both existing uses of global oceans and emerging ones such as offshore energy production, aquaculture, and undersea mining. “The resulting cumulative impact of these activities often leads to ecosystem degradation or even collapse.”

Researchers determined that during the analyzed period, “nearly all countries saw increases in cumulative impacts in their coastal waters, as did all ecosystems, with coral reefs, seagrasses and mangroves at most risk.” However, some regions saw high impacts and are at greater risk for ecosystem collapse: the Black Sea, Eastern Mediterranean Sea, Canadian Eastern Seaboard, Southern Atlantic Ocean, and Southern/Western Australia.

With the new study, the team aimed to provide “a holistic perspective of where and how much human activities shape ocean change—for better or worse—which is essential to policy and planning,” according to a statement from UC Santa Barbara announcing the research.

“If you don’t pay attention to the big picture, you miss the actual story,” said lead author Ben Halpern of the National Center for Ecological Analysis & Synthesis (NCEAS) at UC Santa Barbara. “The bigger picture is critical if you want to make smart management decisions—where are you going to get your biggest bang for your buck.”

The apparent accelerating pace of human impacts on oceans around the world “creates even more urgency to solve these problems,” Halpern added. “We can improve things. The solutions are known and within our grasp. We just need the social and political will to take action.”