Alternative energy

Most of the energy we use comes from burning fossil fuels such as coal or oil. As well as depleting non-renewable resources, it gives off carbon dioxide, which is a greenhouse gas. The alternatives include hydroelectric power, wind turbines, wave power, solar panels, growing biofuels and using geothermal energy. Nuclear power is not normally considered as a type of alternative energy, despite the fact that it doesn't release greenhouse gases.

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Science of Fracking

Shale gas could solve the fuel crisis. But in parts of Europe and America it's been banned over safety fears, and it was blamed in 2011 for a couple minor earthquakes in the UK. Robert Matthews investigates.