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  2. Renewable energy - Wikipedia

    en.wikipedia.org/wiki/Renewable_energy

    Renewable energy in developing countries is an increasingly used alternative to fossil fuel energy, as these countries scale up their energy supplies and address energy poverty. Renewable energy technology was once seen as unaffordable for developing countries. [ 201 ]

  3. Sustainable energy - Wikipedia

    en.wikipedia.org/wiki/Sustainable_energy

    Geothermal energy is a renewable resource because thermal energy is constantly replenished from neighbouring hotter regions and the radioactive decay of naturally occurring isotopes. [90] On average, the greenhouse gas emissions of geothermal-based electricity are less than 5% that of coal-based electricity. [84]

  4. Renewable resource - Wikipedia

    en.wikipedia.org/wiki/Renewable_resource

    Oceans often act as renewable resources. Sawmill near Fügen, Zillertal, Austria Global vegetation. A renewable resource (also known as a flow resource [note 1] [1]) is a natural resource which will replenish to replace the portion depleted by usage and consumption, either through natural reproduction or other recurring processes in a finite amount of time in a human time scale.

  5. The Future of Alternative Energy - AOL

    www.aol.com/news/2012-01-05-the-future-of...

    The problem with alternative energy is that it hasn't been a very good alternative. Wind turbines can't power much on their own. Solar isn't much good without a sunny day.

  6. Energy transition - Wikipedia

    en.wikipedia.org/wiki/Energy_transition

    An energy transition is a broad shift in technologies and behaviours that are needed to replace one source of energy with another. [14]: 202–203 A prime example is the change from a pre-industrial system relying on traditional biomass, wind, water and muscle power to an industrial system characterized by pervasive mechanization, steam power and the use of coal.

  7. World energy resources - Wikipedia

    en.wikipedia.org/wiki/World_energy_resources

    Renewable resources are available each year, unlike non-renewable resources, which are eventually depleted. A simple comparison is a coal mine and a forest. While the forest could be depleted, if it is managed it represents a continuous supply of energy, vs. the coal mine, which once has been exhausted is gone.