Scientists are beginning a month-long experiment in Scottish waters to study the impact of a possible leak from an undersea carbon dioxide storage site.
Working in Ardmucknish Bay near Oban, researchers will allow CO2 to bubble through sediments from a buried pipe and look for impacts on marine life.
Capturing CO2 from power stations and burying it under the seabed is viewed as an important global warming fix.
A number of countries have plants in operation, though the UK does not.
This is believed to be the first time that an impact of CO2 escape on seabed ecosystems has been investigated.
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