This document provides an overview of energy, including definitions of key terms, units of measurement, historical and current patterns of energy use worldwide, projections for future energy use and the types of energy including fossil fuels, renewables, and nuclear. It discusses trends in population, GDP, and carbon dioxide emissions and considers whether the global energy system can stay below 450 parts per million of atmospheric CO2.

1. A World of Energy ENGR40 Foothill College

6. Energy Density / Specific Energy

9. Projected World Energy Use http://en.wikipedia.org/wiki/World_energy_consumption

11. Estimated Daily Consumption of Energy per Capita at Different Historical Points Adapted from: E. Cook, "The Flow of Energy in an Industrial Society" Scientific American , 1971 p. 135 .

12. Income and Energy Use Energy consumption and income: A semiparametric panel data analysis

14. US Energy Flows Lawrence Livermore National Laboratories

16. First there was Fire Incontrovertible evidence of widespread control of fire dates to approximately 125,000 years ago and later. [

25. Petroleum and Octane http://en.wikipedia.org/wiki/Petroleum

26. Proven Oil Reserves http://en.wikipedia.org/wiki/Petroleum

32. Methane

34. Methane Hydrates http://en.wikipedia.org/wiki/Methane_clathrate

37. Ethanol Fuel (Brazil)

38. Algal Biofuels “ The global biofuels industry is entering a new decade of emerging opportunities and considerable challenges in reaching 2020 targets. The global economic recession is already shaking out many of the would-be players in a crowded algae space, and favoring new players with improved strategies . ” http://www.chem.info/Articles/2010/03/Alternative-Energy-Algae-Investment-Trends-Advanced-Biofuels-Insight/

40. Hydroelectric Energy http://en.wikipedia.org/wiki/Hydroelectricity

41. http://en.wikipedia.org/wiki/Hydroelectricity Hydroelectric Energy

42. Geothermal Energy Global capacity of geothermal electric power plants. Upper line is nameplate capacity, lower line is realized production. http://en.wikipedia.org/wiki/Geothermal_electricity

43. Solar (PV and CSP) Solar areas defined by the dark disks could provide more than the world's total primary energy demand (assuming a conversion efficiency of 8%). That is, all energy currently consumed, including heat, electricity, fossil fuels, etc., would be produced in the form of electricity by solar cells. The colors in the map show the local solar irradiance averaged over three years from 1991 to 1993 (24 hours a day) taking into account the cloud coverage available from weather satellites. http://en.wikipedia.org/wiki/Solar_energy

51. Global Population http://en.wikipedia.org/wiki/World_population

52. World Real GDP / Capita http://www.google.com/publicdata/ and active explorer link UN Data, IMF, and US Census Data

53. World Energy Demand and Economic Outlook - http://www.eia.gov/oiaf/ieo/world.html

54. World Energy Demand and Economic Outlook - http://www.eia.gov/oiaf/ieo/world.html

55. World Energy Demand and Economic Outlook - http://www.eia.gov/oiaf/ieo/world.html

56. http://en.wikipedia.org/wiki/World_energy_consumption

57. Atmospheric carbon dioxide concentrations have risen sharply since the Industrial Revolution. Source: Marland, G., T.A. Boden, and R. J. Andres. 2005. Global, Regional, and National CO2 Emissions. In Trends: A Compendium of Data on Global Change. Carbon Dioxide Information Analysis Center, Oak Ridge National Laboratory, U.S. Department of Energy, Oak Ridge, Tenn., U.S.A.

58. CO 2 Emissions => ppm CO 2 How Much of Atmospheric Carbon Dioxide Accumulation Is Anthropogenic? Gary W. Harding - http://accurate.clemson.edu/becker/prtm320/commons/carbon3.html

59. CO 2 Emissions => ppm CO 2 How Much of Atmospheric Carbon Dioxide Accumulation Is Anthropogenic? Gary W. Harding - http://accurate.clemson.edu/becker/prtm320/commons/carbon3.html