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Even simple things like being careful about what groceries you buy can help. Things that are imported from countries far away obviously use more energy (if you know what I mean) because of the transportation, so it's a wise decision to buy things that are either from your own country, or somewhere not too far.
Or to sort your trash, like not mixing paper with plastic, that way it can be re-used and won't require as much energy (to make new material).
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