This report summarizes an analysis of over 18,000 energy and green house gas records covering 22 million square feet of metro Boston hospitals, in a first-in-the-nation, metro sector-wide database. Developed for the Boston Green Ribbon Commission's Health Care Working Group (GRC-HC) by its coordinator, Health Care Without Harm, the data tracks the sector's collective progress towards the GRC's shared goals of a 25% reduction in greenhouse gas (GHG) emissions by 2020, and 80% by 2050.