Date on which the United States is in the world's most ...
Date on which the United States is in the world's most powerful resource-rich countries]
Shale gas is changing the international politics
Possible in the near future [the total energy self-sufficiency]
The US energy policy has changed significantly, the development of shale gas / shale oil during the past 2.0 years is because rapidly progressed.
Shale gas is natural gas which is taken from the formation of sedimentary rock called shale (shale). The gas is present in the shale layer had been confirmed previously, but there is no technology to mine at a low cost, never be almost neglected.
But new technology called hydraulic fracturing method has been developed in the latter half of the 1980s, progress in all at once developed from the fact that with the prospect to perform the mining of natural gas at a relatively low cost. Shale oil well, similar to the shale gas, it can be taken from the shale layer.
Shale layer proceeds is mined around the country because it is widely distributed in the United States, production volume of natural gas and crude oil surge.