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Summary This article describes the importance of metal oxide materials for semiconductor technology, sensor technology, and renewable energies. By the utilization of new material systems and the specific properties of molecular metal oxides, large improvements in energy efficiency and performance can be expected in the future. However, the growing need for raw materials and of their exploitation harbors some global ecological and social conflict potential. The aspects such as recycling and environmental sustainability will continue to gain in significance. [ABSTRACT FROM AUTHOR]