rate of exploration, legal and regulatory wrangling, and challenging geology saw most major companies, including ExxonMobil, Marathon Oil, Eni, and Talisman Energy, pull out of the country. In 2014 Reuters reported that Chevron and ConocoPhillips are the only two major international companies left. Nevertheless, Poland has more shale-gas exploration, drilling, and extraction in progress than any other European country. Poland is highly dependent on coal for electrical generation. Unlike in most of Western Europe, Polish coal mines are still active. Methane in the mine workings poses safety problems. Most methane is currently treated as waste, but studies show that coalbed methane can be profitably used as a gas resource. As of 2010, Poland imports two-thirds of its natural gas from Russia. Tapping shale gas resources would greatly boost Poland's proven reserves, and lessen the importance of gas imports from Russia. In June 2013 Occupy Chevron – an anti-fracking group occupied a field near the Polish village of Żurawlów, close to the city of Zamość. Opinions polls during the same year showed however that more than 70% of Poles were in favour of exploiting their shale resources. In November 2018 the Polish finance ministry determined that Polish gas would be unprofitable mainly due to the potential taxes that would applied on the gas extraction. The Polish politicians have struggled to curb the near-total dominance of coal within the domestic energy system, but the high hopes placed on shale gas has been a result of overstated gas demand projections combined with insufficient assessment of available shale gas resources, caused by small amounts of research done on the deposits. Romania Romanian shale gas reserves could consolidate the country's role as the largest gas producer in Central Europe. In May 2012, the government temporarily suspended permits for shale gas exploration while waiting for the results of the EU's environmental studies on this energy source. In March 2013, Prime Minister Victor Ponta announced that the moratorium on shale gas exploration in Romania had been lifted. This decision could help boost domestic energy resources and reduce Romania's dependency on Russian gas. This decision sparked large nationwide protests aimed at banning the exploitation of shale gas and to remove the current government of Romania. Romania's National Agency for Mineral Resources has launched a study to determine the level of national shale gas resources, whilst a study conducted by the US Energy Information Administration, based on estimates made