Don't buy new books, trade them with PaperBack Swap

While reading a book on your iPad or Kindle may be more environmentally friendly, nothing replaces turning a page and reading a real book. PaperBack Swap is a website for book lovers to swap their books with other members basically for free. What's green about this service is that you're, in essence, reusing and recycling books because you're trading them, thus not having to purchasing brand new ones.