In a world of rising energy prices and an increasing shortage of raw materials, we need intelligent concepts. The consequences of climate change can already be felt everywhere. Sustainability and environmental friendliness are therefore playing an increasingly important role. Many will ask to what extent this is possible. Are we at the level of today's technology so far that we can really solve the big problems of our time. We say yes, we can and we will do that. In cooperation with our global trading partners, we have considered which of the existing technical means and systems are the best in combination. Particular attention was paid to the environmental compatibility and the economic efficiency of the systems. Finally, we came to the conclusion that a combination of solar power, wind energy, hydrogen and fuel cell technology offers the best conditions for this in many respects. But the use of heat pump technology can't be ignored in this context.