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Oceanographic Institution
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Gas Hydrates

Gas hydrates, originally discovered in the laboratory of Sir Humphrey Davy in 1810, are ice-like solids that consist of gas molecules (such as methane) which are enclosed within the cage-like structure of water molecules.

Methane hydrates
Methane trapped in marine sediments as a hydrate represents an immense carbon reservoir. Additional information about gas and methane hydrates was published in February, 2004 in an article by Jean Whelan in the online version of Oceanus.

  Oceanus article about seafloor natural gas

Climate Change
Methane is a 'greenhouse' gas and is therefore also of interest with regard to it's role in climate change.

The image below depicts mechanisms by which gas hydrates influence the environment.