In February 2016, the World Health Organization declared the mosquito-borne Zika virus to be a "public health emergency of international concern" as the disease linked to thousands of birth defects in Brazil spreads rapidly. The distribution of the Aedes mosquitos has drastically increased over the past few decades, which have been the hottest decades on Earth in more than 1000 years based on climate proxy measures. Although a combination of factors explains the current Zika virus outbreak, it's highly likely that the changes in the climate contribute to the spread of Aedes vector carrying the Zika virus, the pathogen causing serious birth defects. Physicians, both individually and collectively, as trusted and educated members of society have critical roles to play. In addition to clinical management and prevention of Zika, physicians should communicate about the health benefits of addressing climate change in straightforward evidence-based language to their local communities and policymakers, and make clear their support for policies mitigating climate change.