One of the chapters in the book is "Wasteful Consumption", which basically focuses on how buying stuff that we don't need, and may never use, we create waste (particularly food waste) and clutter. "We waste billions on clothes and shoes we never wear, exercise equipment we never use, and CDs we never listen to. Uneaten food quickly finds its way to the garbage bin, but these items can be stored for years, so most houses have cupboards, or even rooms, where unused stuff is hidden away. For many the idea of a 'spring clean' now has more to do with disposing of the year's accumulated paraphernalia than with dusting and carpet cleaning." (Hamilton, C. & Denniss, R. Affluenza, Allen & Unwin, Australia, 2005, pp 104-105.)
If this sounds like you, and you want to explore this mindset in the hope of reducing your material consumption before it becomes clutter, I thoroughly recommend the book. It is also available as an Adobe Reader digital download from Dymocks.