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BERLIN, Feb 1 (Reuters) - Germany's upper house of parliament passed a resolution on Friday urging Chancellor Angela Merkel's government to tighten the rules for controversial modern drilling techniques, or fracking, for unconventional gas.
The resolution piles the pressure on the government to draw up clear rules for the practice, which critics say could increase seismic risks and even pollute drinking water.
The Bundesrat upper house, which represents Germany's 16 federal states, passed a resolution that demands an assessment of the environmental impact of fracking and public consultation before it can be started.
"This is about rejecting the use of this technology until the risks are cleared up 100 percent," Torsten Albig, the Social Democrat (SPD) premier of the northern state of Schleswig Holstein, said in the Bundesrat, adding peoples' safety had to be the top priority.
The resolution was proposed by states run by the opposition SPD and Greens in the house where Merkel's centre-right coalition do not have majority.
Permits for fracking, issued by individual states, may only be granted if it is absolutely clear that there is no possibility of the water supply being affected, according to the resolution.
Germany produces only 14 percent of the gas it consumes and shale gas could help mitigate the effects of dwindling gas resources.
Some companies, including ExxonMobil are pushing Germany to explore the possibilities.
Germany's BGR Institute for Geoscience and Natural Resources has said 0.7 trillion to 2.3 trillion cubic metres of the gas could be technically extracted. The bulk of that is located in the northern German plain.
Hydraulic fracturing, or fracking, involves pumping vast quantities of water and chemicals at high pressure through drill holes to prop open shale rocks and release gas trapped underground.
Germany has no national rules on fracking, leaving individual states to decide whether or not to issue permits. However, in recent months, there has been a de facto freeze on granting licences in Germany.
In the United States, vertical drilling processes have created a shale gas boom in recent years, freeing the country of importing needs and changing gas flows in the world market.
Germany's powerful industrial lobby has complained that companies may lose their competitive edge compared to U.S. rivals because of the boom in shale gas which has led to a sharp fall in gas prices there.
The Bundesrat resolution does not, however, compel the government to do anything. (Reporting by Madeline Chambers; editing by Keiron Henderson)