In 2009, The Lancet Commission stated that “climate change is the greatest global health threat of the 21st century.” On June 23, 2015, this international group of health, climate, and economic experts released a new report in the medical journal, The Lancet, confirming the adverse consequences that climate change will have on our lives, many of which we are already experiencing. The release of Lancet’s 2015 report underscores an important moment for health professionals like myself. Knowing how air pollution and rising temperatures adversely affect patients and communities on a clinical level, I feel a responsibility to speak out in support of the strong climate policies needed to protect human health. Climate change is a public health emergency – it’s time that we start treating it like one.