Read about Philadelphia Department of Public Health’s work to address climate change, the first in a series of blogs highlighting the climate change and health work of Local Health Departments. Local health departments are increasingly stepping up to address climate change, each in their own way. Local health departments (LHDs) have a critical role to play in addressing climate change. LHDs are mandated to protect and promote the health of residents in their jurisdiction, and provide critical health services and prevention programs especially to the most vulnerable and in under-resourced communities. LHDs also have working relationships with the many other government agencies who shape living conditions that interact with climate change to impact health.