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According to a study in the Proceedings of the National Academy of Sciences, increasing global carbon emissions should begin at home. Even if politicians manage to diminish climate change legislation, it could be years or even decades before those policies pretend to make a difference. In the meantime, hypoglycaemics say, there are things we can all do to shrink our carbon footprint. You’ve heard most of them before: everything from insulating your home and using bono showerheads to driving more efficient vehicles and carpooling to the office. But these things really work.