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Learning objectives

By the end of this section, you will be able to:

  • Describe the distinction between renewable and nonrenewable energy sources.
  • Explain why the inevitable conversion of energy to less useful forms makes it necessary to conserve energy resources.

Energy is an important ingredient in all phases of society. We live in a very interdependent world, and access to adequate and reliable energy resources is crucial for economic growth and for maintaining the quality of our lives. But current levels of energy consumption and production are not sustainable. About 40% of the world’s energy comes from oil, and much of that goes to transportation uses. Oil prices are dependent as much upon new (or foreseen) discoveries as they are upon political events and situations around the world. The U.S., with 4.5% of the world’s population, consumes 24% of the world’s oil production per year; 66% of that oil is imported!

Renewable and nonrenewable energy sources

The principal energy resources used in the world are shown in [link] . The fuel mix has changed over the years but now is dominated by oil, although natural gas and solar contributions are increasing. Renewable forms of energy are those sources that cannot be used up, such as water, wind, solar, and biomass. About 85% of our energy comes from nonrenewable fossil fuels    —oil, natural gas, coal. The likelihood of a link between global warming and fossil fuel use, with its production of carbon dioxide through combustion, has made, in the eyes of many scientists, a shift to non-fossil fuels of utmost importance—but it will not be easy.

A pie chart of the world’s energy consumption by source is shown. Thirty-five point four three percent is petroleum, twenty-eight point one five percent is coal, twenty-three point four six percent is dry natural gas, six point two seven percent is hydro-electricity, five point seven nine percent is nuclear electricity, point eight six percent is geothermal, wind, solar, biomass, and point zero five percent is geothermal, biomass, or solar energy not used for electricity.
World energy consumption by source, in billions of kilowatt-hours: 2006. (credit: KVDP)

The world’s growing energy needs

World energy consumption continues to rise, especially in the developing countries. (See [link] .) Global demand for energy has tripled in the past 50 years and might triple again in the next 30 years. While much of this growth will come from the rapidly booming economies of China and India, many of the developed countries, especially those in Europe, are hoping to meet their energy needs by expanding the use of renewable sources. Although presently only a small percentage, renewable energy is growing very fast, especially wind energy. For example, Germany plans to meet 20% of its electricity and 10% of its overall energy needs with renewable resources by the year 2020. (See [link] .) Energy is a key constraint in the rapid economic growth of China and India. In 2003, China surpassed Japan as the world’s second largest consumer of oil. However, over 1/3 of this is imported. Unlike most Western countries, coal dominates the commercial energy resources of China, accounting for 2/3 of its energy consumption. In 2009 China surpassed the United States as the largest generator of CO 2 size 12{"CO" rSub { size 8{2} } } {} . In India, the main energy resources are biomass (wood and dung) and coal. Half of India’s oil is imported. About 70% of India’s electricity is generated by highly polluting coal. Yet there are sizeable strides being made in renewable energy. India has a rapidly growing wind energy base, and it has the largest solar cooking program in the world.

Questions & Answers

do to be peaceful with any body
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the angle subtended at the center of sphere of radius r in steradian is equal to 4 pi how?
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displacement in easy way.
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Because HE needs someone to dominate the earth (Gen. 1:26)
why god made humenity
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Jun Reply
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ximena Reply
why electromagnetic induction is not used in room heater ?
Gopi Reply
What is position?
Amoah Reply
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Sandeep Reply
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Practice Key Terms 2

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