Gas hydrate is a special kind of inclusion compound that can be formed by capturing gas molecules to water lattice in high pressure and low temperature conditions. The hydrate crystal structures were different depending on a kind of guest molecules. Recently, gas hydrates have attracted the attention of many investigators from all areas of natural gas production and environmental science from a fact that this compound could be formed from only host water and guest gas molecules. The most attrative application of hydrates is to dispose of carbon dioxide in the form of solid hydrates in the ocean to reduce atmospheric carbon dioxide concentration and mitigate global warming. Therefore, this paper summarized present research works concerning the carbon dioxide hydrate and suggested the connection between these results and the strategies for carbon dioxide sequestration. In addition, general topics and research trends related to carbon dioxide hydrate are presented with focusing on carbon dioxide ocean sequestration to resolve the global warming problems.