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Opponents of hydraulic fracturing, or fracking, demonstrate at a joint budget hearing on health and medicaid in Albany, N.Y., Jan. 30, 2013.Mike Groll/The Associated Press

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 per cent," 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.

However, EU Energy Commissioner Guenther Oettinger urged Germany to keep an open mind on fracking, saying the EU wanted to develop the practice, to produce at least enough gas to replace its own dwindling conventional supplies and to avoid becoming more import-dependent.

Energy costs rather than labour costs were now a decisive factor for some energy-intensive industries in deciding where to set up, he told a conference in Munich, warning that Europe could face deindustrialization.

In the United States, new 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 which has led to a sharp fall in gas prices there.

The resolution was proposed by states run by the opposition SPD and Greens in the house where Ms. Merkel's centre-right coalition do not have a majority.

Permits for fracking, issued by individual states, may only be granted if it is absolutely clear that there is no risk of the water supply being affected, according to the resolution.

Germany produces only 14 per cent of the gas it uses and shale gas could help mitigate the effects of dwindling resources. Some companies, including Exxon Mobil Corp. 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 free 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.

Some other European countries, including Ukraine, Britain and Poland are also beginning to explore the possibilities of shale gas.

The Bundesrat resolution does not, however, compel the government to do anything.