Reducing the environmental footprint of the global food system significantly depends on shifting to more plant-based diets. However, deep-rooted eating habits and a general lack of awareness about food-related emissions hinder large-scale dietary shifts. Demand-side food policies can accelerate this transition towards plant-based diets. One policy instrument that may increase awareness of diet-related emissions and facilitate climate-friendly food consumption choices is a CO2 food label. The success of such demand-side food policies depends on socio-political and market acceptance. However, there is a lack of empirical evidence regarding the socio-political (i.e., feasibility) and market acceptance (i.e., effectiveness at changing behavioral intentions) of CO2 food labels. We also require more knowledge about the potential spillover effects of CO2 food labels on support for more ambitious demand-side food policies. The paper presents evidence from a survey experiment with a sample of Swiss residents (N = 2372) who were randomly provided with information about an established CO2 food label. The survey experiment was embedded in a cooperation throughout a larger long-term project with the second-largest Swiss retailer, which launched one of the world's first CO2 food labels in 2021. Findings show that providing information on a CO2 food label strengthens individuals' behavioral change intentions and support for a mandatory governmental CO2 food label. However, no spillover effect on support for other food policy instruments is identified, which also means that the study finds no crowding out effect by voluntary CO2 labelling initiatives on the support of governmental food policy measures. The results imply that a CO2 food label enjoys high market and socio-political acceptance.

减少全球粮食系统的环境足迹在很大程度上取决于转向更多以植物为基础的饮食。然而，根深蒂固的饮食习惯和对食品相关排放普遍缺乏认识阻碍了大规模的饮食转变。需求方粮食政策可以加速向植物性饮食的转变。二氧化碳食品标签是一项可以提高人们对饮食相关排放的认识并促进气候友好型食品消费选择的政策工具。这种需求方粮食政策的成功取决于社会政治和市场接受度。然而，缺乏关于二氧化碳食品标签的社会政治（即可行性）和市场接受度（即改变行为意图的有效性）的经验证据。我们还需要更多地了解二氧化碳食品标签对支持更雄心勃勃的需求方食品政策的潜在溢出效应。本文提供了对瑞士居民样本 (N = 2372) 进行的调查实验的证据，这些居民被随机提供了有关既定二氧化碳食品标签的信息。该调查实验嵌入在与瑞士第二大零售商的一个更大的长期项目中的合作中，该项目于 2021 年推出了世界上第一个二氧化碳食品标签。研究结果表明，在二氧化碳食品标签上提供信息可以增强个人的行为改变对强制性政府二氧化碳食品标签的意图和支持。然而，没有发现对其他粮食政策工具的支持产生溢出效应，这也意味着该研究发现自愿二氧化碳标签倡议对政府粮食政策措施的支持没有挤出效应。 结果表明二氧化碳食品标签享有较高的市场和社会政治接受度。