Abstract
The climate crisis poses the greatest threat to human health this century. Mental health services will be called on to address the psychological consequences of its effects on peoples' lives, particularly the socially disadvantaged and those on low incomes. However, healthcare systems are also contributors to the climate crisis. This editorial discusses how services can continue to provide care while contributing less to climate change. Specifically, it suggests what services such as forensic mental healthcare, which is constrained by legal, political and resourcing concerns, can do differently.