tag:blogger.com,1999:blog-11753665457196760352011-06-15T13:09:05.231-07:00sarahhttp://www.blogger.com/profile/09757259021326118822noreply@blogger.comBlogger11100tag:blogger.com,1999:blog-1175366545719676035.post-62873189537494164782011-06-15T13:09:00.000-07:002011-06-15T13:09:01.428-07:00Most of the sources of energy that exist today are derived from non-renewables, primarily coal and petroleum. Coal is used by various power plants all over the world. Although different countries have now made it a point to replace coal-fired power plants with more positive <a href="http://www.energyformankind.org/renewable-energy-2/renewables-are-positive-energy-sources-2/">renewable energy</a> sources like solar, wind, hydro, geothermal and wave.<div class="blogger-post-footer"><img width='1' height='1' src='https://blogger.googleusercontent.com/tracker/1175366545719676035-6287318953749416478?l=penndesignmfa.blogspot.com' alt='' /></div>sarahhttp://www.blogger.com/profile/09757259021326118822noreply@blogger.com0