British Telecom has announced a three-year plan to get all of its energy needs from renewable sources - the biggest such project in the world.
The electricity used, worth hundreds of millions of pounds, could power a city the size of Nottingham.

Renewable sources of energy include wind, wave and solar power, rather than using fossil fuels like oil or coal.

The power will be used in all of BT's 6,500 phone exchanges, as well as its satellite relay stations and offices.

The plan comes after the government's call for 10% of the UK's energy to have come from non-polluting renewable sources by 2010, in an effort to halt global warming.

Burning fossil fuels such as oil and coal are blamed by some scientists as a major contributor to rising temperatures.

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