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Why haven't free energy devices replaced fossil fuels yet?

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Sunlight and wind are free, but photovoltaic systems and wind turbines have an upfront capital cost and a lifetime maintenance cost. There are two main barriers to adopt these technologies: * Financial, not everyone can afford them. read more

” Because it takes time. Solar and wind are doubling ever 2 and 4 years and will produce more energy than the world uses, not just electricity in 10 to 20 years. read more

We have been aware of the benefits offered by renewable energy sources for some time now. Using evidence from the lesson, give at least two reasons why renewable energy sources have yet to completely replace the use of fossil fuels. read more

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