The medical profession prides itself on ‘doing no harm’. But to whom or what? Healing patients means looking after a community, and that means being responsible about our impact on the world we live in. Like with any sustainable movement, the aim is always to make our mark on the overarching system that we work in, which in this case is healthcare. That’s a big task, and not everyone will agree. But it starts with us: in our wards, our theatres, and our clinics. Practising safe and thorough healthcare requires an enormous amount of physical resources, from gloves to packaging to anaesthetic agents. But it doesn’t mean we can’t reduce our waste and make healthcare more sustainable. This section of the conference explores how it can be done.