The exercise of environmental ‘leverage’ via trade-related measures and trade in environmental goods offers opportunities to tackle the climate crisis and advance transnational decarbonization. Inward-looking, adversarial, and short-term national security-centred approaches, however, are disrupting the trade and climate change mitigation linkage. This article employs the race for critical raw materials and US and EU strategies to promote the net-zero transition at the domestic level as case studies to illustrate the environmental pitfalls of the ‘securitization’ of the trade and climate change mitigation nexus. The article demonstrates that the pursuit of strategic dominance in key net-zero sectors, attempts to exclude systemic rivals and reshore supply chains, opportunistic forms of friendshoring and loose agreement on regulatory means jeopardize recourse to environmental ‘leverage’ and undermine decarbonization at both national and transnational levels. This analysis casts a light on the inherent tension between national security and climate change mitigation. Taking stock of these findings, the article advocates a radically different approach to the governance of the trade and climate change mitigation nexus.

The three-dimensional flow field past an I-shaped dual-step cylinder has been obtained by numerical integration of the Navier–Stokes equations at Reynolds number ($Re_D$) 150. The I-shaped cylinder consisted of two large-diameter (D) cylinders with a small-diameter (d) cylinder in between. With a view to exploring the vortex dynamics and structural loads, simulations were performed for eight different lengths $l$ of the small cylinder, varied from $l/D=10$ to 0.2 for a fixed diameter ratio $D/d=2$. When the length of the small cylinder is sufficiently large, the wake behind the I-shaped cylinder is similar to the wake behind the single-step cylinder (Tian et al., J. Fluid Mech., vol. 891, 2020, A24). As the small cylinder length decreases, the enhanced interactions between the two steps make the present wake deviate from the wake of the single-step cylinder, leading to four different wake modes distinguished by different combinations of vortex cells. The physical formation mechanisms were analysed in terms of the vortex dynamics. Besides the wake flow, the streamwise vortices around the I-shaped step cylinder were also investigated. A pair of edge vortices and a junction vortex were identified for $l/D \geq ~1$. When the gap between the two steps becomes too small, $l/D \leq ~0.2$, the junction vortex disappears, and only a pair of edge vortices exists. Varying the distance between the two steps strongly affects the structural loads (drag and lift) along the I-shaped cylinder. The dependence of the loads on $l/D$ was readily explained by the different wake modes.

We consider time-inhomogeneous ordinary differential equations (ODEs) whose parameters are governed by an underlying ergodic Markov process. When this underlying process is accelerated by a factor $\varepsilon^{-1}$, an averaging phenomenon occurs and the solution of the ODE converges to a deterministic ODE as $\varepsilon$ vanishes. We are interested in cases where this averaged flow is globally attracted to a point. In that case, the equilibrium distribution of the solution of the ODE converges to a Dirac mass at this point. We prove an asymptotic expansion in terms of $\varepsilon$ for this convergence, with a somewhat explicit formula for the first-order term. The results are applied in three contexts: linear Markov-modulated ODEs, randomized splitting schemes, and Lotka–Volterra models in a random environment. In particular, as a corollary, we prove the existence of two matrices whose convex combinations are all stable but are such that, for a suitable jump rate, the top Lyapunov exponent of a Markov-modulated linear ODE switching between these two matrices is positive.

Borderline personality disorder (BPD) is a highly stigmatised mental disorder. A variety of research exists highlighting the stigma experienced by individuals with BPD and the impacts of such prejudices on their lives. Similarly, much research exists on the benefits of engaging in compassionate acts, including improved mental health recovery. However, there is a notable gap in understanding how stigma experienced by people with BPD acts as a barrier to compassion and by extension recovery. This paper synthesises these perspectives, examining common barriers to compassionate acts, the impact of stigma on people with BPD, and how these barriers are exacerbated for individuals with BPD due to the stigma they face. The synthesis of perspectives in the article highlights the critical role of compassion in supporting the recovery of individuals with BPD, while also revealing the significant barriers posed by stigma. Addressing these challenges requires a comprehensive understanding of the intersection between compassion and stigma, informing the development of targeted interventions to promote well-being and recovery for individuals with BPD.

The higher-educated were long supposed to be winners of technological change, but recent evidence indicates that they feel (and are) increasingly exposed to the risk of technological redundancy. Based on what is known about how lower- to medium-skilled workers respond to technological exposure, this new sense of vulnerability among the higher-educated could have significant political effects – specifically increased support for right-wing populist parties – but empirical evidence on this is still lacking. I address this gap and investigate the effects of technological vulnerability on the party preferences of the higher-educated using survey data from the 2022 Risks that Matter survey. I find that feeling technologically vulnerable does indeed increase support for populist right-wing parties and reduce support for left parties among the higher-educated. I also conduct mediation analyses to explore the mechanisms behind these patterns and find evidence for a significant but substantively small mediation effect of social policy preferences.