Support for climate change mitigation can be promoted by secure human attachment

Attachment is an ethological approach to the development of durable affective ties betweenhumans. We propose that secure attachment is crucial to understand climate change mitigationbecause the latter is inherently a communal phenomenon resulting from joint action, and requiring collective behavioral change. Here we show that secure (vs. insecure) attachment is associated with a higher willingness to pay taxes and prices to mitigate climate change (Study 1 N=1006 U.S. nationally representative sample). We also establish that priming attachment security increases acceptance (Study 2 N=173) and perceived responsibility about anthropogenic climate change (Study 3 N=209). Next, we show that priming attachment security, compared to a standard National Geographic video about climate change, increases monetary donations to a proenvironmental group in politically moderate and conservative individuals (Study 4 N=196). Lastly, in a preregistered field study conducted in the United Arab Emirates involving 130 nationalities (Study 5 N=143,558 food transactions), we show that an attachment-based message reduces food waste compared to a message related to carbon emissions. Our work suggests that a new avenue to promote climate change mitigation could be grounded in core ethological mechanisms associated with secure attachment.

Going nowhere fast: a review of seed dispersal in eucalypts

Eucalypt species have several features that make them particularly well suited for climate change studies. A key assumption is that they have very limited powers of dispersal. If this is correct, it means that climate change analyses to the end of this century can concentrate mainly on assessing whether or not eucalypt species are likely to be able to survive at their existing sites. A recent major climate change study of more than 600 eucalypt species for the period 2014–2085 has used 5 km as a usual dispersal limit for the period to 2085, with the possibility of rare long-distance events. The review presented here considers how far natural stands of eucalypt species are likely to be able to migrate in the period to 2085. It is the first review to consider eucalypt seed dispersal as its major focus. It draws on evidence from millions of years ago to the present, and from eucalypt stands in Australia and around the world. Although rare long-distance events cannot be entirely ruled out, it is concluded that the great bulk of the evidence available indicates that the most likely potential dispersal rate is equivalent to about 1–2 m per year, i.e. ~70–140 m in the period to 2085. Over decades, this is likely to occur as a series of stepwise events, associated with disturbances such as bushfires. However, limitations such as inadequate remnant eucalypt stands and extensive agricultural developments may reduce actual migration rates below even this modest potential.