Energy is something we use every day, seamlessly delivered to our home in the case of electricity and abundantly available in the case of gasoline and diesel fuels. Energy has come a long way since the early 1800s, when wood and whale oil were common energy sources. And coal, once a major part of the energy mix in the United States, is being rapidly replaced by natural gas and renewable energy sources, especially wind and solar photovoltaic (PV) energy. China, the most populated country in the world, is still highly dependent on coal, but is also rapidly implementing renewable energy sources. An examination of worldwide energy use shows that for different countries, energy use per capita is correlated with average income. This indicates that an increasing world population coupled with growing economies, especially for China and India, will put pressure on energy availability and cost in the future.
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