The present study examined the overall potential that the COVID-19 pandemic and its restrictions have for the promotion of climate-friendly food consumption in Germany. We looked at COVID-19-related changes in people’s climate-friendly food-consumption behaviors by comparing retrospectively self-reported performances between the time period in which the COVID-19 restrictions were in place and the pre-COVID-19 period. Furthermore, we examined the durability of such COVID-19-related changes with regard to an imagined post-COVID-19 period and the role of people’s personal climate-protection norms in COVID-19-related behavioral changes. To do so, we conducted two online surveys in June/July 2020 with German consumers: (a) an online study in a sample that was representative of the German population (NCOR1 = 3092) and (b) another online study in a smaller sample of German consumers (NCOR2 = 300). Altogether, the data from both surveys indicated several COVID-19-related changes toward more climate-friendly food consumption, not only during the COVID-19 pandemic and its restrictions, but also with regard to long-term changes in a potential post-COVID-19 period. Furthermore, our results also provide initial empirical evidence that people’s personal climate-protection norms are relevant moderating factors of these short- and long-term COVID-19-related behavioral changes.

The climate crisis poses a major threat for sustainability, with the young and future generations likely to be among the most affected groups in the climate crisis. Older generations will be less affected but have a greater impact both in terms of contribution and mitigation. We investigated potential intergenerational drivers of older Germans’ climate protection intentions and behavior in two pre-registered studies (N₁ = 411, 55- to 75-year olds; N₂ = 309, 55- to 86-year olds). On a correlational level, both studies revealed that contact between generations (particularly high-quality contact) indirectly explained the participants’ climate protection intentions/behavior. This effect was mediated by affinity with younger people (Study 1) and its subfacets of perspective taking and empathic concern (but not the subfacet of perceived oneness; Study 2). Study 1 further provided evidence that legacy motivation, i.e., the desire to leave behind a positive legacy, was positively related to participants’ climate protection intentions and behavior. Study 2’s attempt at testing the causal role of the subfacets of affinity was not successful, as the experimental manipulation of perspective taking toward younger people failed. However, the two studies provide correlational evidence that the closer older people feel to younger people and the future consequences of their behaviors, the more willing they are to protect the climate.

The effect of energy-efficient technology is frequently diminished by so-called rebound effects. Experimental vignette methodology (EVM) is introduced as an experimental research methodology for controlled testing of psychological interventions to reduce such rebound effects after the rebound has been induced. The potential of EVM is validated in two studies. In Study 1 ( N = 735), EVM is validated by an experimental test of four empirically well-supported intervention techniques: information provision, self-commitment with goal setting, comparative feedback, and comparative feedback augmented by injunctive norms. As expected, information provision had no effect, self-commitment with goal setting increased energy-saving intention, while comparative feedback had the strongest effect. Study 2 ( N = 121) demonstrates the potential of EVM for analyzing mediating mechanisms, in this case how social norm and personal norm mediate the impact of comparative feedback. The findings underscore the value of the EVM as a methodology for systematic, controlled testing of causal intervention effects.