The main focus is the search for alternative energy sources and the use of alternative (non-traditional) sources of energy. Energy sources - "naturally occurring substances and processes that allow us to obtain the necessary energy for existence." An alternative source of energy is a renewable resource, it is a substitute for traditional sources of energy, functioning on oil to produce natural gas and coal, which when burned emit into the atmosphere of carbon dioxide, contributing to the growth of the greenhouse effect and global warming. The reason for the search for alternative energy sources - the need to obtain it from renewable energy or virtually inexhaustible natural resources and phenomena. Into account may be taken as ecology and economy.