Alternatives to oil, natural gas and coal provide only a small fraction of the fuel needed to power U.S. factories, businesses, homes and vehicles. But as worries increase over the cost of relying on limited natural resources, more Americans are looking to alternative energy sources. From President Bush to former Vice President Al Gore and environmentalist actor Robert Redford, voices around the country are calling for an end to our addiction to oil, whether through technological change, conservation or local initiatives. With increasing political and environmental concerns, the United States and the world are changing the way they look at building, buying and fueling vehicles, homes and offices. Do green buildings, hybrid cars and eco-investments hold the solution to our dependence on fossil fuels?