NGH is commonly known as "combustible ice" as it looks like ice and burns easily, and it is mainly found in deep-sea sediments or permafrost areas. It consists of 80 to 99.9 percent methane and produces much less pollution than coal, oil and natural gas.
The planet’s abundant reserves of gas hydrate could potentially sustain mankind’s current energy needs for about 1,000 years, so it is regarded as an important alternative to polluting fossil fuels like oil, coal and natural gas.
If gas is present at sufficient concentrations beneath the seafloor within the gas hydrate stability field, it to be in the form of hydrates.
But that stability field is easily disrupted if either pressure or temperature is changed, releasing all that trapped methane into the water. That's why successfully extracting gas from methane hydrates is such a big deal for engineers.
The gas deposits are densely packed - 1 cubic metre of methane hydrate can release 164 cubic metres of natural gas if brought to the surface, making it a valuable fuel resource.
Researchers think there could be immensely abundant gas hydrate reserves all around the world, possibly exceeding all other fossil fuels combined.