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Recent reports suggest that ongoing methane release from marine gas hydrates (particularly at high latitudes) may be linked to warming climates (Paull et al., 2007; Westbrook et al., 2009; Reagan and Moridis, 2009), although the historical baseline data needed to confirm such conclusions are limited. Certainly, the linkage between gas hydrate and climate is complex: recent data contradict previous concepts of gas hydrate as a major participant in Quaternary climate events (in particular, the abrupt terminations of glacial periods), as isotopic data from ice cores suggest that terrestrial (wetlands) sources are most likely responsible for all excess atmospheric methane associated with these events (Sowers, 2006; Petrenko, et al., 2009). It now appears likely that only the most significant historic climate episodes, such as the Paleocene-Eocene Thermal Maximum (PETM), may have meaningful gas hydrate- related feedbacks, although even in that case, the data are open to various interpretations (Dickens, 2008).