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So we can reduce pollution considerably:
1) Buy local. It means two way trip for food producers to your store's supplier. Hopefully a hundred miles or less X two ways.
Because:
2) Buying out of season means transporting products hundreds or thousands of miles to your store's supplier X two ways.
We all have to eat. If we think local and buy local it means reducing carbon emissions from trucks and ships and vans used to bring the food to you. Next time you walk to the grocery store, think how far the product you are buying has to come to you.
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