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The consumption of energy is an indispensable part of human life, but energy demand is often met by fossil fuels such as gasoline, diesel, heating oil and natural gas. Their combustion generates negative externalities, primarily in the form of greenhouse gas emissions such as carbon dioxide (CO2). To avoid these externalities, economists mainly advocate making the consumption of fossil energy more expensive in the form of CO2 prices, for example via prices for certificates on the EU Emissions Trading System. The competence area researches how private households react in their energy consumption to such energy price increases.