Amid escalating climate challenges, we examine relationships between longtermism beliefs with policy-level and grassroots climate-protective attitudes and actions. Across four primary pre-registered studies (N = 4451) and two supplementary pilots (N = 1858), we find that a significant portion, approximately 25% of our participants, who endorse the longtermism ethical philosophy, report heightened climate change concerns. Furthermore, longtermists show stronger support for pro-climate policies, advocate for initiatives in line with climate justice for future generations and present-day minoritized groups and make proactive contributions to environmental causes and initiatives. Moreover, we find that responsibility to distant future generations drives these associations. Through a targeted intervention, we boosted intergenerational responsibility and increased donations to an environmental charity. These findings highlight how longtermism beliefs shape pro-environmental attitudes and actions, offering valuable insights for climate advocacy strategies and cultivating more widespread support for comprehensive environmental policies.
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