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The reason is that there is plenty of fossil carbon down there, and we keep finding more: the Japanese have just demonstrated how to mine sub-ocean methane clathrates.
a type of hairstyle which has a long, thin strip of hair growing down the back of the neck
a 'U'-shaped piece of metal fitted on the side of a boat to hold an oar in position
(of a politician) to be able to communicate and connect with ordinary people
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Definition and synonyms of clathrate from the online English dictionary from Macmillan Publishers Limited.