exception of uranium) we are using them up at a rapid pace. Renewable energy resources such as Solar energy, wind energy, small hydroelectricity (e.g. Swimming hydroelectric power plant), geothermal energy and biomass fuels are becoming increasingly attractive. Solar, Photovoltaics, water and wind energy do not send pollutants into the air as occurs with coal and petroleum energy. Hydrogen storage (storage by hydrogen) The objectives are to store H2 in solid metal hydrides from which it can be readily recovered by heating which is an alternative and safe, highly volume efficient storage method. The final aim is to provide a storage technology that is attractive both economically and environmentally. See also Green building Passive house Zero-energy building Energy Autonomy: The Economic, Social & Technological Case for Renewable Energy, by Hermann Scheer Examples 1st zero-energy-hotel Boutiquehotel Stadthalle won "Klimaschutzpreis 2010" Autarc floating pavilion Green Energy Options for Housing Renewable energy options for buildings: Case studies Energy Autonomy: New Politics for Renewable Energy References External links The Passive House – historical review Habitats Sustainable energy