The claim that "renewable"/"green" energy could be sufficient to replace fossil fuel sources is (probably) false. Here is a very short article that outlines several of the problems.
Wind and Solar Energy Are Dead Endshttp://www.americanthinker.com/articles/2017/07/wind_and_solar_energy_are_dead_ends.htmlExcerpts:
Renewable energy is the way of the future, we are told. It is inevitable. Some renewable energy advocates boldly claim that the world could be powered by renewable energy as early as 2030 – with enough government subsidies, that is. And of course, the mainstream media play their part, hyping up the virtues of solar and wind energy as the solution to climate change.
In one regard, they are quite right: in terms of generational capacity, wind and solar have grown by leaps and bounds in the last three decades (wind by 24.3% per year since 1990, solar by 46.2% per year since 1990). However, there are two questions worth asking: (i) are renewable energies making a difference, and (ii) are they sustainable?
To answer the first question: No, wind and solar energy have not made a dent in global energy consumption, despite their rapid growth. In fact, after thirty years of beefy government subsidies, wind power still meets just 0.46% of earth's total energy demands, according to data from the International Energy Agency (IEA). The data include not only electrical energy, but also energy consumed via liquid fuels for transportation, heating, cooking, etc. Solar generates even less energy. Even combined, the figures are minuscule: wind and solar energy together contribute less than 1% of Earth's energy output.
Bottom line: Renewables are not making a difference.
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To answer the second question: Is renewable energy sustainable? Is the future wind- and solar-powered?
No.
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This is not to say wind and solar energy have no uses. In some cases, they may be preferable to other types of energy. For example, in remote locations townships and homesteads can benefit greatly from local electricity production, especially since renewable energy does not require fuel. However, wind and solar energy are unlikely to underpin the global energy supply, so long as more cost-effective and efficient options remain on the table.