Report - Widespread methane leakage from the sea floor on the ... · LETTERS NATUREGEOSCIENCEDOI:10.1038/NGEO2232 65¡ W 65¡ W 40¡ N 45¡ N 30¡ N 70¡ W 35¡ N 30¡ N 30¡ N 40¡ N 75¡

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