A new internet site shows homeowners and small businesses the impact of their energy use on the environment and how they can get on the green bandwagon. The US Department of Energy's Energy Efficiency and Renewable Energy Network added a section to its web page that helps the small guy find out how and where to buy green power -- and if it would be right to add renewable energy technology on his property. Users can investigate small wind turbines, photovoltaics and micro-hydro systems. The site also has a pollution calculator that determines how much pollution can be avoided if 100% renewable resources are used instead of the normal mix of coal and gas. Plug in two bits of information -- monthly electric bill and state -- and the site spits out the amount of carbon dioxide, nitrous oxide and sulphur dioxide for the amount of electricity used. And to avoid that pollution, it points users towards the green marketing program in their area.