The list of things an individual can do to lessen their environmental impact could fill a book, and it's up to the person to determine where they can best act.

The list of things an individual can do to lessen their environmental impact could fill a book, and it's up to the person to determine where they can best act. These ideas are easily googleable, which is why I suggest that changing the attitude from "hole up with food and guns" to "look for ways to be proactive".