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Volume 655 Issue 8123, 16 July 2026
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Volume 655 Issue 8123, 16 July 2026

Meadows mapped

The cover shows a seagrass meadow in shallow water off the coast of Grand Bahama in the Bahamas. Seagrass makes up a crucial marine ecosystem that supports biodiversity as well as helping to protect the shoreline and sequestering carbon. Despite their wide benefits and potential as a natural mechanism to help combat climate change, seagrass ecosystems are relatively poorly understood. In this week’s issue, Jiwei Li and colleagues present a global map of seagrass along with an analysis of how seagrass extent has changed over a four-year period at the start of this decade. The researchers used 4.75 million satellite images captured across two periods — 2019–20 and 2023–24 — to map seagrass meadows in waters up to 30 metres deep. They found that 69% of global seagrass is concentrated in the Bahamas, Cuba, the United States, Australia and Indonesia, but that only 21% of seagrass is within the boundaries of current marine-protected 0areas. By comparing the maps derived for the two time periods, the team was able to trace how the extent of seagrass changed, finding that 4% of seagrass was lost and another 4% degraded over the four years studied.

Cover image: Will Greene, Perry Institute for Marine Science, Arizona State University.

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  • Gene editing systems allow researchers to inactivate genes with surgical precision.

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