Effectively reducing climate change requires marked, global behavior change. However, it is unclear which strategies are most likely to motivate people to change their climate beliefs and behaviors. Here, we tested 11 expert-crowdsourced interventions on four climate mitigation outcomes: beliefs, policy support, information sharing intention, and an effortful tree-planting behavioral task. Across 59,440 participants from 63 countries, the interventions’ effectiveness was small, largely limited to nonclimate skeptics, and differed across outcomes: Beliefs were strengthened mostly by decreasing psychological distance (by 2.3%), policy support by writing a letter to a future-generation member (2.6%), information sharing by negative emotion induction (12.1%), and no intervention increased the more effortful behavior—several interventions even reduced tree planting. Last, the effects of each intervention differed depending on people’s initial climate beliefs. These findings suggest that the impact of behavioral climate interventions varies across audiences and target behaviors.

Insights from the analysis of views towards energy sources are of paramount importance for the setting of successful energy policies, especially in instances where the public might be reluctant towards certain projects’ implementations. This work presents an analysis of social media comments data given in response to posts around the connection to the grid of a nuclear plant reactor in the United Arab Emirates (UAE). We assessed comments on Facebook posts of local and international media, as well those written in response to a post of a social media influencer. We extracted the main themes and performed sentiment analysis. The results indicate the presence of mixed views towards nuclear energy when focusing on comments on international media’s posts as well as on the social media influencer’s post considered, whilst they were very positive when assessing comments to local media. All in all, nuclear waste and previous nuclear accidents appear to be as the top of the mind; at the same time, solar energy is often suggested in the comments as a viable energy source for the UAE. Implications for the communication of nuclear energy developments in social media are discussed.

Background: The COVID-19 pandemic has caused major public health and economic disruption. At the same time, a pandemic allows researchers to assess market efficiency; namely, whether, to what extent, and how swiftly stock markets incorporated information related to COVID-19. Soon after the outbreak of the pandemic, research on this front was conducted, with a particular focus on the United States of America (US) market. However, new major events linked to the pandemic have unfolded: a number of vaccines were announced and authorized. The research available in relation to market efficiency relative to vaccine availability is scant. The aim of this study was to assess market efficiency hypotheses with regards to the US and United Kingdom (UK) markets, investigating the impact of the promising news of the vaccines’ successful trials and, subsequently, their authorization. M e t h o ds: This work considered data from the S&P500 for the US market and the FTSE100 for the UK market. The time interval considered ranged from the date positive results of vaccines’ trials were first announced, 18 November 2020, until up to two months after the vaccines’ authorization that happened later in December 2020. For both markets, we analyzed the daily returns, cumulative returns, standard deviation and average returns. Results: In both the US and the UK, there was a positive effect of the vaccines’ announcements in terms of increase in the daily returns. However, the standard deviation was not found to increase substantially, notwithstanding the increase in the COVID-19 cases worldwide and the potential lockdown in several countries, as well as the fear from new coronavirus strains that the new vaccines might not be protect against. Conclusions : Whilst both markets displayed an increase in the average return following the vaccines’ announcements, the UK market seemed to reflect vaccines’ announcements faster than the US market.