We normally use four things to generate electricity: oil, coal, natural gas (= fossil fuels). They are called non-renewable sources of energy. The reserves of them may be used up (may run out) soon.
Moreover, all of them cause terrible pollution problems: they produce gases. And these gases cause acid rain and the greenhouse effect.
Another source of energy is nuclear power. The problem is that nuclear power leaves dangerous radioactive waste.
The solution to this problem is to prefer alternative sources of energy. They are environment-friendly, cheap and renewable:
• geothermal energy (the energy from the hot centre of the earth)
• hydro-electric power (the everlasting power of the streams)
• wind power (wind generators / wind mills – they are ugly and noisy but they produce cheap electricity)
• solar power (a very cheap way of producing electricity in sunny countries)
• bioenergy (an environment-friendly way of producing biofuel or biogas from biomass
(= organic wastes).
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