Avoid disposing any waste on the streets, in nature, and especially not in the gutter. This rubbish can end up in the water treatment system and overcharge the decontamination process. Take advantage of city waste baskets. They are everywhere and that's what they are for.
The plastic bags you use but for a few minutes can last for as long as 15 to 1,000 years in the environment. Don't get a new plastic bag each time you go shopping. Get a funky re-useable or cotton bag instead and say 'no thanks' to plastic or paper bags.
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