Healthy environment, public involvement, diversity and inclusion, mental health, mental wellbeing, nature, co-production.  A healthy environment, as defined by leading global and national health organisations—the World Health Organization, UNICEF, and the United States Center for Disease Control and Prevention—includes air, land and water that is safe for human health, supportive of healthy lifestyles, and free of hazards such as toxic chemicals which can reduce quality of life and create health problems. Clean air and water, sanitation and green spaces, safe workplaces can enhance people’s quality of life: reduced mortality and morbidity, healthier lifestyles, improved productivity of workers and their families, improve lives of women, children and elderly and are crucial to mental health.