The most important type of renewable energy sources are wind and solar energy. This is because wind currently leads the way as the most developed energy source, and solar energy is expected to dominate global energy market in years to come. Fossil fuels (coal, oil and natural gas) still play the most important role in global energy supply, and they look very likely to remain dominant sources of energy for at least next couple of decades because renewable energy sources still need to significantly decreases their costs, find adequate storage solutions to solve intermittency issue.
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