methane hydrates methane hydrates methane clathrates methane hydrates methane hydrates methane hydrates methane hydrates methane hydrates methane hydrates methane hydrates methane hydrates methane hydrates http://en.wikipedia.org/wiki/Methane_hydrates methane hydrates methane clathrates methane hydrates methane hydrates methane hydrates methane hydrates methane hydrates methane hydrates methane hydrates methane hydrates methane hydrates methane hydrates methane hydrates methane hydrates methane hydrates methane hydrates