Extracting shale gas has environmental consequences and puts pressure on scarce water resources, requiring strict monitoring and regulation, energy and water experts said, reports Thomson Reuters Foundation.
The United States has taken the lead in shale gas exploitation, and it is ‘only a matter of time’ before other countries follow, according to Andreas Lindström, team leader of the water, energy and food nexus at the Stockholm International Water Institute (SIWI).
“Before that, we need to first understand clearly the impact of such extraction, devise policies based on that knowledge, and if feasible, do it in the most environmentally friendly way possible,” he told Thomson Reuters Foundation at the World Water Week conference in Stockholm.
Extraction process dangers
In a report released this week, SIWI highlighted the possible dangers of the process used to extract shale gas, widely known as fracking.
“These questions include the climate impacts of methane leaks during fracking operations and of CO2 (carbon dioxide) released when methane is combusted (and) are still relatively unknown, as well as the risks of contamination and depletion of water resources,” the report said.
Large amounts of water are needed for drilling and fracking, which breaks rock formations in the earth using pressurised liquid and allows hydrocarbons to flow to the surface.
Shale resources in arid areas
Another report released on Tuesday by the US-based World Resources Institute (WRI) warned that 38% of known global shale resources are in areas that are arid, or under high or extremely high levels of water stress.
“Furthermore, 386 million people live on the land over these shale plays, and in 40 percent of the shale plays, irrigated agriculture is the largest water user. Thus drilling and hydraulic fracturing often compete with other demands for freshwater, which can result in conflicts with other water users,” the WRI report said.
SIWI’s Lindström fears that countries identified in the WRI report – like China and South Africa – where shale resources are located in areas of water stress will start extracting them soon.
Ahead of that, there is an urgent need for scientific data on the impacts and a governance regime that promotes best practice, he said.
The WRI report argued that the challenges highlight ‘a strong business case for strategic company engagement in sustainable water management at local and regional levels’.
“They also point to a need for companies to work with governments and other sectors to minimise environmental impacts and water resources depletion,” it added.
Lindström, who co-authored the SIWI report, said very little research has been carried out on the new technologies used in fracking. But there are signs that large-scale extraction is detrimental to water resources in water-stressed areas, such as the US state of Texas.