How to "reduce carbon emissions" for buildings? Track the "carbon footprint" of buildings 
How to "reduce carbon emissions" for buildings? Track the "carbon footprint" of buildings How to "reduce carbon emissions" for buildings? Track the "carbon footprint" of buildings How to "reduce carbon emissions" for buildings? Track the "carbon footprint" of buildings How to "reduce carbon emissions" for buildings? Track the "carbon footprint" of buildings Source: Popular Science China Network
