Introduction.- Shale gas: History of Development.- The Evaluation of the World Potential of Shale Gas Reserves.- Shale Gas Production in the USA.- Shale Gas in Europe: Reserves, Production and Perspectives.- European policy and "Shale Revolution".- Shale Gas Production in Germany: Ecology and Political Aspects.- Shale Gas Production in Poland.- Potential environmental impacts of hydrofraccing related to exploration of unconventional hydrocarbons in Hungary.- An Overview of Unconventional Resources of Romania and the pending shale gas challenges.- Shale gas potential of Bulgaria.- Shale Gas Production in Moldova: Achievements and Potential.- Role of Shale Gas in the Energy Policy of Ukraine.- Shale Gas in Russia: New Outlines of the Energy Policy.- Evaluation of the Shale Gas Resource Potential in Kazakhstan.- China Stakes on the Shale Gas.- The Role of Shale Gas in the Global Energy.- Shale Gas Production and Environmental Concerns.- Conclusions.