The carbon footprint of health system employee commutes

Background: Greenhouse gas emissions from employee commutes contribute to the carbon footprint of the healthcare sector. We sought to analyze the patterns of employee commutes and quantify the resulting greenhouse gas emissions for three large health systems in Cleveland, Ohio. Methods: An employee survey was obtained and reviewed for data regarding home location, mode of commute, distance traveled, and commute time. Emissions for each survey participant were estimated using the United States Environment Protection Agency Emission Factor Inventory. Emissions per survey participant were multiplied by the total number of employees to estimate commute-related emissions for each health system. Results: A total of 3,192 employees responded to the survey, including 988 from Cleveland Clinic, 271 from VA Medical Center, and 1933 from MetroHealth System. The vast majority of survey participants drove by themselves to work in an automobile. Annual greenhouse gas emissions per participant (in kg CO2-eq) were 1750 (Cleveland Clinic), 3333 (VA Medical Center), and 2834 (MetroHealth System) with variations due to differences in commute distances. Total annual emissions per health system were estimated as: 36,006,250 (Cleveland Clinic), 11,998,800 (VA Medical Center), and 22,672,000 (MetroHealth System). Conclusions: Employee commutes are a potential area of intervention to decrease the carbon footprint of healthcare institutions. We recommend that health systems periodically survey employees to understand commute patterns and work with employees and policymakers to support and promote lower-emission transportation modes.