<P> Alternative energy is any energy source that is an alternative to fossil fuel . These alternatives are intended to address concerns about fossil fuels , such as its high carbon dioxide emissions , an important factor in global warming . Marine energy , hydroelectric , wind , geothermal and solar power are all alternative sources of energy . </P>
why should we look for the alternative sources of energy than fossil fuels
to address concerns about fossil fuels , such as its high carbon dioxide emissions , an important factor in global warming