According to leading climate experts an effi cient and preventive climate protection strategy requires a 50% reduction of the anthropogenic greenhouse gas emissions worldwide. Taking this fact into account, and considering the very unequal access to energy services in industrial and developing countries, the dramatic situation becomes even more apparent – more than 2 billion people in developing countries do not have access to modern energy supplies therefore in the decades to come energy consumption in these countries will increase considerably. So to signifi cantly decrease the anthropogenic greenhouse gas emissions will only be possible by relying on energy systems based on renewable energy sources.