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Clean Energy
Clean energy is very difficult to come by. Many people believe that electricity is clean and that an electric car is better than a gasoline powered one. If the electricity was produced from solar power than yes, it is clean, but most electricity is generated by burning coal or through nuclear power plants. Electricity can actually be worse than a gasoline powered car when produced at an old inefficient coal burning plant.
One of the main problems with clean energy is that it relies on natural sources which are not constant. The sun only shines during the day, and on cloudy days output is greatly impeded. Extreme northern and southern latitudes have even further problems only having sufficient sunlight for half the year. Wind is not constant either with many wind farms sitting idle on calm days.
Because of this natural ebb and flow of clean energy many different sources are still required for constant production of usable power. The combination of wind power, solar power and other sources such as sea power and even nuclear power are ways of overcoming the individual problems of each method for extracting power. Growing food and plants for fuel is proving to be very inefficient and brings with it an even higher cost, hunger.