Climate change is closely linked to rising levels of atmospheric carbon dioxide and methane due to human activities, and soaring temperatures might themselves pose a risk to natural carbon sequestration in the land. This editorial introduces three papers in the current issue exploring the adverse effects on mental health of climate-related loss of biodiversity and cultural heritage markers and the beneficial effects of adopting a plant-based diet. It also suggest three simple steps that clinicians can themselves take to act against climate change: choosing and recommending a plant-based diet, reducing personal use of fossil fuels and integrating climate change in discourse in all areas of their professional work.

Climate change can have various psychopathological manifestations which have been more actively addressed by scientific research only in recent years. Indeed, extreme weather events and environmental changes have been shown to be associated with a range of mental health problems. Following the destruction of ecosystems, biodiversity loss can cause mental distress and emotional responses, including so-called ‘psychoterratic’ syndromes arising from negatively felt and perceived environmental change. Studies investigating relationships between biodiversity and mental health reveal a complex landscape of scientific evidence, calling for a better understanding of this challenging issue.

It is now widely acknowledged that low- and middle-income countries in Africa are among global hotspots for high vulnerability to climate change, despite making comparatively low contributions to this phenomenon. Climate change has been shown to affect mental health as a result of disruption of social and economic structures that populations depend on for good health, including mental health. After decades of neglect, recent efforts by governments such as in Kenya to address the twin issues of climate change and mental health demonstrate the growing importance of these issues. Here we briefly review the evidence of climate change impacts on mental health in Africa and demonstrate that there is need for more contextual awareness and research in this area in Africa to mitigate or forestall potential mental health crises in the near future. We recommend systematic efforts to support funding for research and interventions at the nexus between climate change and mental health in Africa, and urge institutions and governments in Africa to begin paying attention to this emerging threat to the health of African populations.

There is growing interest in the health and environmental benefits of whole-food plant-based (WFPB) diets. The current global food system is harmful to our planet and is a key driver of climate change, pollution and biodiversity loss. A transition to WFPB diets will mitigate against these impacts and potentially reduce agriculture greenhouse gas emissions by up to 80%. Emerging evidence suggests that such diets also have significant physical and mental health benefits and can be useful in preventing and treating a range of conditions. Psychiatrists therefore have an important role to play in promoting WFPB diets among patients.

Indigenous people face numerous challenges to their mental health across the world. We consider the situation in Bangladesh, where those living in the remote hill tracts areas of Eastern Bangladesh experience widespread difficulties. Few seek attention for their problems from professional services, in part because of stigma or a lack of awareness that help could be made available, but also because in these remote areas few resources are available. We make recommendations to improve this situation, which could be implemented with the assistance of primary healthcare services and traditional healers.

The Royal College of Psychiatrists’ Medical Training Initiative (MTI) enables qualified foreign-trained psychiatrists to gain further experience within the UK National Health Service (NHS). This article summarises the observations of two Nigerian psychiatrists during their forensic psychiatry placements on the MTI scheme and two of their UK supervisors. It discusses similarities and differences between Nigeria and the UK in forensic psychiatry, including the use of mental health legislation, the scope of forensic psychiatry and elements of the pathway to qualification in both countries. It concludes with recommendations that could improve the robustness of the MTI scheme.

The Netherlands has an unique system of perinatal and postpartum healthcare. Pregnancy care is delivered predominantly by primary care midwives and childbirth services predominantly involve hospital care. The first week postpartum, all women receive daily care from maternity nurses. In addition, hospitals and out-patient clinics offer perinatal mental healthcare. More specifically, ‘POP care’ (psychiatry, obstetrics and paediatrics) was developed to promote multidisciplinary collaboration in this regard. Although clinical practices and government initiatives to improve pregnancy-related mental healthcare work well, they have yet to be fully described and evaluated. The current COVID-19 pandemic has an impact on health services and perinatal mental health.

Healthcare workers have faced an unprecedented workload in overstretched health facilities during the COVID-19 pandemic, and we describe various initiatives to support them. Psychological, financial and peer support, accommodation and meal services, proper personal protective equipment, applause and gratitude in the community, spiritual and religious life, child care and volunteering were identified. The potential effects of the COVID-19 pandemic – permanent stress, burnout and other mental health problems among healthcare professionals – can be expected to grow. Continued monitoring is essential to bolster resilience among healthcare workers and prevent the possible consequences for their mental health.