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These ocean drones are trawling for climate change data

The autonomous vessels -- called "Saildrones" -- resemble bright red surfboards. Each is fitted with a 20-foot-high carbon fiber sail, and 16 sensors that test variables including carbon dioxide, acidity, currents and water temperature.

The drones, which cruise at a leisurely 3-5 miles per hour, are doing work typically reserved for manned research ships -- but for a small fraction of the cost.

By Andrew Turner

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