“…Judgments of environmental impact are influenced by several systematic biases (Holmgren, Andersson, & Sörqvist, 2018; Pasca, 2022; Pasca & Poggio, 2021; Sokolova et al, 2023; Sörqvist et al, 2020). For example, while people accurately assign a higher carbon footprint to two petrol cars in comparison with one petrol car, they tend to think two hybrid cars have the same impact as one (Kim & Schuldt, 2018)—a quantity insensitivity (Kusch & Fiebelkorn, 2019); when people judge how much carbon binding is necessary to compensate for a specific amount of CO 2 emission, they tend to think more is needed when the emissions are caused by an immoral action (Sörqvist, MacCutcheon, et al, 2022)—a moral spillover; when people rate the energy intensiveness of household appliances, they tend to assign higher values to larger objects although the opposite is often more accurate (Cowen & Gatersleben, 2017)—a size heuristic; and when a meal with red meat (a relatively carbon footprint intensive food type) is combined with an organic apple (a side dish with a relatively low carbon footprint), the perceived carbon footprint of the whole meal is reduced (Gorissen & Weijters, 2016)—a negative footprint illusion (Holmgren et al, 2018, 2018).…”