Alternative Energy Sources looks at the different options for replacing fossil fuels. It explores how the energy potential of the oceans can be captured using wave power generators, how solar energy could be captured with solar paint and solar satellites, and how nanocrystals boost photovoltaic cell charge. It discusses the environmental concerns surrounding genetically modifying crops for use as biofuels, whether or not all cars could be run on hydrogen fuel cells, and how underwater kelp forests could be the key to boosting biogas production.