Estimating greenhouse gas emissions from the health sector in Canada: Mind the gap.

Healthcare is a surprisingly large contributor to climate change, responsible for a significant quantity of global Greenhouse Gas (GHG) emissions. Global commitments to achieve "net zero" health systems, including by the federal government in Canada, suggest a growing need to understand and mobilize capacity for GHG emissions estimation across Canada's health sector. Our analysis highlights efforts by public sector healthcare organizations in Canada to estimate an increasingly broad scope of GHG emissions, building on longstanding efforts to report or reduce energy-related emissions from facilities. It also identifies why such efforts will not be sufficient. Developing capacity for routine system-wide greenhouse gas emissions estimation can help Canada's health systems to better understand their progress, including through international comparison. Yet emissions estimation is itself an investment, one that should not displace efforts to reduce the full scope of pollutants from the healthcare enterprise, and to build a truly sustainable health system.