The discovery of fossil fuels such as coal led to the greatest improvement in energy efficiency. In the late 1900s, these fuels accounted for 85% of the world’s energy use. Suddenly, slavery and animal labor became unprofitable because fossil fuels were so efficient. Everyone’s income and standard of living rose as a result of the use of fossil fuels.
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A positive look at how far we have come, and how much good we can do, together.
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The historical significance of urban centers
The impact of cultural and technological advances
The role of urban centers in shaping society
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