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Recognizing the urgent need for concrete sectoral information in designing European climate change mitigation pathways of policy relevance, this study formulates, simulates and compares 31 European decarbonization pathways, focusing on changes in trade flows and GHG emissions. This paper exploits the rich sectoral details from a large bottom-up built system dynamics energy model (the European Calculator model), soft-linking it to a tailor-made computable general equilibrium model (GTAP-EUCalc). Our modeling results suggest that increasing decarbonization ambitions leads to higher reductions of greenhouse gas emissions in Europe (EU27 plus the UK and Switzerland), but with the undesirable outcome of decreasing its external competitiveness through worsened trade balance, if the rest of the world does not reciprocate Europe's decarbonization ambition. A comparison of results across pathways …