Marine current power the rotation of the earth. The sun acts as the primary driving force, causing winds and temperature differences. Because there are only small fluctuations in current speed and stream location with minimal changes in direction, ocean currents may be suitable locations for deploying energy extraction devices such as turbines. Other effects such as regional differences in temperature and salinity and the Coriolis effect due to the rotation of the earth are also major influences. The kinetic energy of marine currents can be converted in much the same way that a wind turbine extracts energy from the wind, using various types
Costing the Earth Costing the Earth Costing the Earth is a programme on BBC Radio 4 about the environment. According to the programme´s website, it looks at man's effect on the environment and how the environment reacts, questioning accepted truths, challenging those in charge and reporting on progress towards improving the world. The programme reports on all matters relating to the environment. The most recent series has covered topics as diverse as the impact of having a baby on the environment and Germany's energy revolution. Notably the series worked with BBC2's Newsnight programme and the BBC World Channel's Our World to produce a