This pump reduces your home's energy demand
German company Vaillant's ``green`` heat pump uses natural refrigerants to drastically improve the efficiency of heating, cooling and domestic hot water supply in existing buildings.
Turning sunlight into renewable aviation fuel
The German Aerospace Center (DLR) has launched a new project focused on producing renewable transportation fuels from water and carbon dioxide with concentrated sunlight. CNN looks at how the EU-backed Sun-to-Liquid project is developing a solar kerosene that could be the answer to sustainable aviation in the future.