Hydroelectricity

Some countries use water to generate electricity. Huge dams are built in rivers and lakes, and the flow of water out of these dams is used to power great turbines which produce electricity.

Creating hydroelectricity does not release carbon dioxide or any harmful substances into the environment. However, building the dams can cause massive damage to river and lake systems. The flow of the river is disturbed and many animal homes are flooded or destroyed. People can also be affected — some dams being built in Asia will require many people to find new homes. There is a limit to how many rivers can be dammed.

Some new hydroelectric schemes do not cause flooding though, and can make a useful contribution to renewable energy production on a smaller scale.

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