Renewable Energy Sources

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What percentage of the world's total energy is supplied by renewable energy sources?

20%

50%

13.5% (correct)

10%

What is the process by which green plants convert sunlight into plant material?

Photosynthesis (correct)

Fermentation

Decomposition

Respiration

By what year could alternative energy sources provide half of the world's energy needs, according to some studies?

2050 (correct)

2030

2040

2060

What is the main source of biomass energy in less-developed countries?

Fuelwood Signup and view all the answers

What is the competitive energy source with renewable energy sources?

Fossil fuel sources Signup and view all the answers

What percentage of world energy consumption is accounted for by the 25 member countries of the Organization for Economic Cooperation and Development (OECD)?

40 percent Signup and view all the answers

What is the approximate percentage of conventional fossil fuels in the total energy consumption?

85 percent Signup and view all the answers

What is the primary factor determining energy use?

Political stability in oil-producing countries Signup and view all the answers

What are nonrenewable energy sources characterized by?

Resources being used faster than can be replenished Signup and view all the answers

What was the effect of declining energy costs in North America and Europe during the 1980s?

People became less concerned about energy consumption Signup and view all the answers

What percentage of world energy consumption is accounted for by oil?

33 percent Signup and view all the answers

What is the primary source of renewable energy used worldwide?

Hydroelectricity Signup and view all the answers

What is the primary difference between a resource and a reserve?

A resource is a naturally occurring substance, while a reserve is a substance that can be economically extracted Signup and view all the answers

What geological process transformed organic matter into coal?

Heat and pressure from sediment Signup and view all the answers

Renewable Energy Sources

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Questions and Answers

What percentage of the world's total energy is supplied by renewable energy sources?

What is the process by which green plants convert sunlight into plant material?

By what year could alternative energy sources provide half of the world's energy needs, according to some studies?

What is the main source of biomass energy in less-developed countries?

What is the competitive energy source with renewable energy sources?

What percentage of world energy consumption is accounted for by the 25 member countries of the Organization for Economic Cooperation and Development (OECD)?

What is the approximate percentage of conventional fossil fuels in the total energy consumption?

What is the primary factor determining energy use?

What are nonrenewable energy sources characterized by?

What was the effect of declining energy costs in North America and Europe during the 1980s?

What percentage of world energy consumption is accounted for by oil?

What is the primary source of renewable energy used worldwide?

What is the primary difference between a resource and a reserve?

What geological process transformed organic matter into coal?

What is the approximate percentage of global energy provided by renewable energy sources?

What is the primary environment in which plants accumulated to form coal?

What is the primary factor that affects the levels of fossil fuel reserves?

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