Affluenza: The All Consuming Epidemic
It talks about a wide range of things, but the main points are: Americans over-consume, Why we over-consume, Why over-consuming will not make us feel better, the environmental effects of our consumption, etc.
It is a good book to open your eyes to some of your spending habits and your consuming impact on the world.
It has helped me see that you do not NEED that new toy or gizmo, as it will become old soon and you will stop using it. It tells how you will never be happy just by buying new things. (You know the story, about lottery winners and rich people not being happy)
It teaches that the true source of happiness with all cultures and all civilizations is human to human and human to nature interaction. (Getting back to nature)
It also encourages you to do activities that give you a sense of accomplishment.
I have read it numerous times. I read it when I start to feel gluttonous again and go shopping for a new gizmo.