Shale gas development where the main environmental threats

Exploration and exploitation of shale gas potential environmental hazard does exist, reflected in the five areas.
The first is that the water came from.Ceramic proppant Shale gas water consumption is large, several times the conventional gas exploration. If the operating block near abundant runoff, shale gas problem. If you just have nearby creeks, streams will dry shale gas.
Secondly, the use of  hydraulic fracturing  of shale gas extraction technology, fracturing fluid to add a variety of chemical substances. These chemicals are safe, and whether it will penetrate into the groundwater to early preparedness. In addition, there are chemicals leaking into surface water hazards. Pollution of surface water and groundwater in shale gas exploitation are required precautions.
The third aspect relates to underground flowback wastewater treatment. Flowback wastewater pumped downhole not contain chemical substances, as well as the formation of the unknown substance, are potential sources of contamination.
The fourth aspect of the atmospheric pollution. Shale gas exploitation in the fracturing fluid is made from sand mixed with water, sand pressed into shale gas displace them. Sand is ground prior to use of very fine particles, blown air is contaminated itself. Construction process, if the wall is not strong enough, gas, and sand may also spread to the air pollution.
In addition, shale gas mining process,frac sand use diesel truck transport water and gas, substantial increase in the number of trucks on the air pollution caused by emissions.
Finally, fugitive methane emissions are also potential sources of contamination. Shale gas is the main component is methane, methane is more powerful than carbon dioxide greenhouse gases, once the leak will cause the chain of contamination.
But I think that these problems can be controlled, the government has enacted laws and regulations to regulate.