Boston hospitals lead the nation in reducing greenhouse gas emissions and have taken advantage of the energy savings by investing in hospital infrastructure, patient care, and energy-intensive research, according to a report from Health Care Without Harm. The report details how Boston healthcare facilities cut their emissions 29% between 2011 and 2015 and are projected to further reduce emissions 33% by 2020. The cuts exceed the mandated reduction goals set by the state of Massachusetts, which aim for a 25% reduction by 2020. The data was gathered from hospitals serving on the Boston Green Ribbon Commission’s Health Care Working Group.