Future Energy is a former accreditation scheme for green electricity in the United Kingdom, designed to support and stimulate electricity generation from renewable energy sources. The coming decades will bring big changes in energy systems throughout the world. The systems are expected to change from central power plants producing electricity and maybe heat for the customers to a combination of central units and a variety of distributed units such as renewable energy technologies or fuel cells. Future Energy will allow us to make reasonable, logical and correct decisions on our future energy as a result of two of the most serious problems that the civilized world has to face; the looming shortage of oil (which supplies most of our transport fuel) and the alarming rise in atmospheric carbon dioxide (resulting from the burning of oil, gas and coal and the loss of forests) that threatens to change the worlds climate through global warming. The Future of Energy discusses the sources, technologies, and tradeoffs involved in meeting the worlds energy needs. A historical, scientific, and technical background set the stage for discussions on a wide range of energy sources, including conventional fossil fuels like oil, gas, and coal, as well as emerging renewable sources like solar, wind, geothermal, and biofuels.