How could producing 25 percent of U.S. electricity and motor-vehicle transportation fuels from renewables by the year 2025 affect U.S. consumer energy expenditures and CO2 emissions? This report finds that reaching 25 percent renewables with limited impact on expenditures requires significant progress in renewable-energy technologies and biomass production. Without substantial innovation in these areas, expenditures could increase considerably.

In his 2006 State of the Union address, President George W. Bush enunciated goals for increasing the use of biomass fuels in transportation and curbing oil imports. Using a computer model, RAND assessed the possible impact that a 25-percent renewable energy target for electricity and motor vehicle ground transportation could have on total national energy expenditures and on emissions of local air pollutants and carbon dioxide by the year 2025. Currently, 6 percent of America's energy use comes from renewable sources, including hydropower. The authors estimate that about 18 percent of total demand in 2025 could be met by renewables. Further, as renewable energy supplants nonrenewable energy, demand for fuels declines, driving down the prices of fossil fuels in the model. In most cases considered in the study, significant reductions in carbon dioxide emissions could also be achieved. The authors were able to identify potential critical points and ranges where changes in the prices of oil, gas, coal, or renewable technologies are found to result in a reduction or increase in energy expenditures.

The world is getting warmer. Among scientists concerned with global climate change this is the broad consensus. How fast and by how much, are questions which cannot be answered quantitatively, but the probability of rising temperatures must be faced in a prudent manner - there is enough certainty of change so that we must anticipate and prepare before irreparable damage is done to our world. Even if it isn't going to be as bad as some people think, the actions we propose will benefit the earth and give us a kind of insurance. The root of the change is population growth, and its attendant demand for energy. While the developed world expects to hold future emissions relatively steady, the developing countries, where population growth is most rampant, will expand the use of energy as they aspire to a better quality of life. H greater energy use is inevitable it behooves us to produce that energy in the least objectionable manner, and to produce it where the cost is lowest in dollars, GNP, and environmental change.

How could producing 25 percent of U.S. electricity and motor-vehicle transportation fuels from renewables by the year 2025 affect U.S. consumer energy expenditures and CO2 emissions? This report finds that reaching 25 percent renewables with limited impact on expenditures requires significant progress in renewable-energy technologies and biomass production. Without substantial innovation in these areas, expenditures could increase considerably.

Energy production and use touch our lives in countless ways. We are reminded of the cost of energy every time we fill up at the gas pump, pay an electricity bill, or purchase an airline ticket. Energy use also has important indirect impacts, not all of which are reflected in current energy prices: depletion of natural resources, degradation of the environment, and threats to national security arising from a growing dependence on geopolitically unstable regions for some of our energy supplies. These indirect impacts could increase in the future if the demand for energy rises faster than available energy supplies. Our nation's challenge is to develop an energy portfolio that reduces these impacts while providing sufficient and affordable energy supplies to sustain our future economic prosperity. The United States has enormous economic and intellectual resources that can be brought to bear on these challenges through a sustained national effort in the decades ahead. America's Energy Future is intended to inform the development of wise energy policies by fostering a better understanding of technological options for increasing energy supplies and improving the efficiency of energy use. This summary edition of the book will also be a useful resource for professionals working in the energy industry or involved in advocacy and researchers and academics in energy-related fields of study. America's Energy Future examines the deployment potential, costs, barriers, and impacts of energy supply and end-use technologies during the next two to three decades, including energy efficiency, alternative transportation fuels, renewable energy, fossil fuel energy, and nuclear energy, as well as technologies for improving the nation's electrical transmission and distribution systems.

This Intergovernmental Panel on Climate Change Special Report (IPCC-SRREN) assesses the potential role of renewable energy in the mitigation of climate change. It covers the six most important renewable energy sources - bioenergy, solar, geothermal, hydropower, ocean and wind energy - as well as their integration into present and future energy systems. It considers the environmental and social consequences associated with the deployment of these technologies, and presents strategies to overcome technical as well as non-technical obstacles to their application and diffusion. SRREN brings a broad spectrum of technology-specific experts together with scientists studying energy systems as a whole. Prepared following strict IPCC procedures, it presents an impartial assessment of the current state of knowledge: it is policy relevant but not policy prescriptive. SRREN is an invaluable assessment of the potential role of renewable energy for the mitigation of climate change for policymakers, the private sector, and academic researchers.