Hydraulic Fracturing is a non-conventional extractive technique developed in the United States to produce natural gas mainly from shale deposits.
The final product, generally referred as shale gas, is a mixture of different fossil fuels, but consisting mainly of methane (CH4), a vital resource of energetic supply in Western countries.
Shale gas can become a primary cheap resource in times when other fossil fuels are growing scarcer and alternative technologies fail to prove a long-term reliability.
As a side effect, though, several emissions are released in the air, or, technical jargon, ‘vented’.
These emissions are either substances trapped underground together with the natural gas or left overs from the extractive process.
You can learn more about hydraulic fracturing in our ‘essential’ web page: Fracking: The Essential.
This picture is taken from the Public Herald, you can see the results of their research here.