Boston’s top hospitals aren’t waiting around to see what happens with the Paris climate accord.

Hospital executives in Boston decided several years ago to collectively cut their greenhouse gas emissions by 25 percent in time for 2020, lining up with a statewide mandate set by the Legislature. Now, we’re learning the hospitals surpassed that goal — three years early.

Boston Medical Center CEO Kate Walsh and Partners HealthCare CEO David Torchiana will share their sector’s progress on Tuesday with the Boston Green Ribbon Commission, a group charged with addressing climate change. Walsh and Torchiana represent the health care sector on the panel.

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