The impact of place and legacy framing on climate action: A lifespan approach

Mediation analyses We conducted two mediation analyses to assess whether legacy motivation mediated the Leg- acy induction’s effect on behavioral intentions (Fig 3), and whether legacy motivation medi- ated the Legacy induction’s effect on donations (Fig 4). Dummy coding was used on predictor variables to allow for comparisons between the control and Legacy induction conditions. Given the simplicity of our models and the distributions of the variables involved, we chose the straightforward four-step mediation approach of Baron and Kenny (1986) [37]. In step 1 of the first analysis, we revealed that exposure to the Legacy induction had a significant effect on behavioral intentions, b = .203, t(676) = 5.39, p < .001. Next, the Legacy induction was found to have a significant effect on legacy motives, b = .248, t(675) = 6.64, p < .001. In step 3, Fig 2. Impact of legacy and place inductions on pro-environmental behavioral intentions and donations to charity. (a) Impact of Legacy and Place inductions on pro-environmental behavioral intentions. (b) Impact of Legacy and Place inductions on donations to an environmental charity. Error bars denote ±1 SEM. Control n = 394, Legacy n = 295, Place n = 299. https://doi.org/10.1371/journal.pone.0228963.g002 Table 2. Mean donation amount by age group and induction type. Induction Age Group Mean 95% Confidence Interval Lower Bound Upper Bound Place Young 3.58 2.95 4.21 Middle 4.29 3.67 4.91 Older 4.09 3.51 4.67 Legacy Young 3.52 2.89 4.15 Middle 3.61 3.04 4.19 Older 4.54 3.91 5.18 Control Young 2.90 2.38 3.41

Middle 3.45 2.90 4.01 Older 3.71 3.19 4.23 https://doi.org/10.1371/journal.pone.0228963.t002 Impact of framing on climate action PLOS ONE | https://doi.org/10.1371/journal.pone.0228963 February 25, 2020 8 / 17