“…The series includes two new articles: how to take steps to reduce waste and loss of nitrous oxide, a potent greenhouse gas, in healthcare settings (doi:10.1136/bmj-2023-076649), and guidance on reducing iron dosing in people with iron deficiency (doi:10.1136/bmj-2023-075741). 89 It aims to tap into the power of individuals, channelling the wisdom of UN secretary general António Guterres, who warns that the climate crisis requires us to do “everything, everywhere, all at once” (doi:10.1136/bmj.p2461). 7…”