Renewable energy is defined as energy that is produced by natural resources such as sunlight, wind, rain, waves, tides, and geothermal heat that are naturally replenished within a time span of a few years. Renewable energy includes the technologies that convert natural resources into useful energy services:
• Wind, wave, tidal, and hydropower (including micro- and river-off hydropower)
• Biomass and biofuel technologies (including biogas)
• Renewable fraction of waste (household and industrial waste)
Household and industrial waste is composed of different types of waste. Some parts are considered renewable energy sources for example, potato peel whereas other parts, such as plastic products, are not. Only the fraction of waste that is naturally replenished is usually included in the definition. In this book, however, for practical reasons, the whole waste fraction is included as part of the renewable energy sources identified in most analyses.
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Global warming is a huge problem which will significantly affect every country in the world. Many people all over the world are trying to do whatever they can to help combat the effects of global warming. One of the ways that people can fight global warming is to reduce their dependence on non-renewable energy sources like oil and petroleum based products.