1. Organize a trash cleanup.
Scoop trash you find around your neighborhood into a plastic or paper bag. Be sure to wear disposable gloves or gloves you can get dirty. This is a lot of fun with a group of 3 or 4 friends.
2. Cut down on paper use.
Try to go a whole day without using any more paper than you need to. Try using paper with one side written on already.
3. Organize your used paper.
Ask yourself, "Can I make something out of this paper?" "Does it only have one side with writing on it?" "Can it serve another purpose?"
This is good to do since we only have so much time until we can't go outside anymore, it will be too cold.