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A data storage company wants to siphon water from the bay here to cool its equipment, a process it says is greener and more sustainable than using traditional air cooling.

But the idea is not winning over some environmentalists, because the water will warm slightly by the time it’s returned to the bay and they say that could potentially damage marine wildlife.

Earlier this month, Nautilus Data Technologies of Pleasanton presented its idea for the project to the Alameda City Council, which must sign off on the innovative project. Nautilus wants to lease three buildings at the former U.S. Navy base and run about a mile of pipeline.