Book contents
- Global Resources and the Environment
- Reviews
- Global Resources and the Environment
- Copyright page
- Dedication
- Contents
- Preface
- Acknowledgments
- Figure Credits
- Part I Introduction, Dynamic Systems, and Change
- Part II People
- Part III Climates
- Part IV Landforms
- Part V Biodiversity
- Part VI Water
- Part VII Agriculture
- Part VIII Energy
- 23 Energy Sources, the Energy Cycle, Exergy
- 24 Conserving Energy and Renewable Energy
- 25 Future Energy: Reducing Fossil Fuel Use
- Part IX Minerals
- Part X Forests
- Part XI Perspective
- Book part
- Index
- Plate Section
- References
23 - Energy Sources, the Energy Cycle, Exergy
from Part VIII - Energy
Published online by Cambridge University Press: 05 July 2018
Book contents
- Global Resources and the Environment
- Reviews
- Global Resources and the Environment
- Copyright page
- Dedication
- Contents
- Preface
- Acknowledgments
- Figure Credits
- Part I Introduction, Dynamic Systems, and Change
- Part II People
- Part III Climates
- Part IV Landforms
- Part V Biodiversity
- Part VI Water
- Part VII Agriculture
- Part VIII Energy
- 23 Energy Sources, the Energy Cycle, Exergy
- 24 Conserving Energy and Renewable Energy
- 25 Future Energy: Reducing Fossil Fuel Use
- Part IX Minerals
- Part X Forests
- Part XI Perspective
- Book part
- Index
- Plate Section
- References
Summary
Energy exists in many forms, such as solar radiation, gravity, and chemical energy. Its total amount is constant, but can change among forms. Energy such as heat from wood burning is insufficiently concentrated (insufficient exergy) to do some work, such as power a laser. Energy reaching the Earth comes in many forms, primarily solar radiation. The total energy to the earth is one thousand times as much as people currently use. The challenge is to find ways to harness desired types of this energy. Solar energy is reflected, radiated and convected and so recycled many times before it returns to space; it circulates through many pools: geologic/solar, atmospheric, hydrologic, and biologic. People presently obtain most energy from fossil fuels. Energy can move by many mechanisms: conduction, transport and convection, radiation, transmission, reflection, absorption, and reradiation.
- Type
- Chapter
- Information
- Global Resources and the Environment , pp. 365 - 374Publisher: Cambridge University PressPrint publication year: 2018
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