In comparison, the land requirements of an actual coal plant are instead rather limited. In addition, there is significant offshore extraction, which has no direct land requirement even though it generates ecological impacts of its own. It should also be noted that oil-fired electricity generation is small and declining. A gas well uses about 5 acres (0.02 km2) of land, while the equivalent surface for oil would be about 50 acres (0.2 km2) per well (NRC, 2010).