How many sources of energy do you see? Solar Wind Hydro Nuclear Tides Waves Fossil Fuels Biomass Geothermal SourceProsCons Sun free source unlimited env. friendly not efficient expensive set-up SourceProsCons Natural heat coming from the Earth free source unlimited env. friendly expensive set-up few locations SourceProsCons Burning natural products or waste free source env. friendly gets rid of waste environment better use of natural products? SourceProsCons Moving river water cheap source env. friendly recreation flooding impacts expensive set-up SourceProsCons Ocean waves free source unlimited navigation safety eyesore SourceProsCons Rising and falling water free source unlimited two-way only 25 locations navigation safety eyesore SourceProsCons Moving air free source env. friendly expensive set-up eyesore, birds inconsistent source SourceProsCons Atom splitting not expensive source lots of source safety concerns expensive set-up weapons possible SourceProsCons Burning of coal, oil, or natural gas not expensive source or set-up readily available environment not renewable