Huge amounts of methane (a potent greenhouse gas) are stored in the sea floor in the form of solid methane hydrates. Warming oceans are causing these hydrates to destabilize. Scientists have documented the release of methane from the floor of the Arctic Ocean. They reported that there are fields in the Arctic where the release is so intense that the methane does not have time to dissolve into the seawater but rises to the surface as large bubbles. This video corroborates lab tests which show that massive amounts of methane have the capacity to affect the buoyancy of ships and even cause them to sink.
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