Of the bacterial isolates found in the Arctic that are able to degrade PCBs, none used compounds such as 2-chlorobiphenyl, 3-chlorobiphenyl, camphor, citronellol, cymene, dehydroabietic acid, limonene, methanol, n-hexadecane, pentachlorophenol, phenol, or pinene as primary growth substrates (Master and Mohn 1998).
In the 20th century, demand for electricity led to the consideration of geothermal power as a generating source. Prince Piero Ginori Conti tested the first geothermal power generator on 4 July 1904, at the same Larderello dry steam field where geothermal acid extraction began. It successfully lit four light bulbs. Later, in 1911, the world's first commercial geothermal power plant was built there.
Geothermal energy can be found in the form of volcanoes, hot springs and geysers. Geothermal energy has three main uses: Heating, Electricity generation and Geothermal heat pumps. Geothermal energy is used since ancient times in form of hot water.Geothermal energy exploit uses three basic types of geothermal power plants: Dry steam, Flash steam and Binary power plant.eothermal energy is also widely used in the state of Nevada. Geothermal energy got its name from Greek words: geo (earth) and therme (heat), and therefore geothermal energy is in fact Earth's heat.. Geothermal energy has minimum negative environmental impact.