Gas hydrate is a solid crystalline material composed of water and natural gas that forms at low temperature and high pressure. Gas hydrates represent an important reservoir of natural gas, even if the current global estimate is very rough. The increasing attention to gas hydrates is arising from (1) the assessment of methane hydrates as a new relatively clean energy source, (2) the relationship between gas hydrate and global climate, (3) the geological hazards related to gas hydrates, and (4) recent programs to sequester CO_2 in gas hydrate reservoirs.
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