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The practical options for energy range from the standard fuels, natural gas, petroleum (or oil), and coal. Fossil fuels are referred to as nonrenewable energy sources because, once used, they are gone. Scientists are exploring the practicality of other sources called renewable energizes. These include sun, wind, geothermal, water, and biomass. The renewable power resources are very important in long range energy planning simply because they will not be depleted. Most people have either watched or been aware of the movie Wall-e. It was a an adorable film, set way into the near future, regarding the adventures of a little robot that's left out that is known to in the mess left out by humans. The humans are living in space when they wait for earth to get re-habitable to allow them to all return. Wall-e meets another robot called EVE, who may have been delivered to earth to hunt out any indications of new life (growing plants), falls in love and follows her into space where they may be associated with a lot of antics before Wall-e eventually returns to earth with EVE, the humans follow and so they started so that it is a fantastic place to live again.