Zero Wast Home by Bea Johnson. After reading this book I changed a lot of my wasteful, unnecessary habits (including buying books I only read once). A few of the big changes I have made include:Good points @sayee. For me, it starts at home and is really about using less. I highly recommend a book called

• Stop taking free stuff because it's free! Pens, paper, shampoo etc from hotels. Use it there, fine, but resist the urge to take another pen or little shampoo that you don't need.
  All the promo items companies try to give away at their little table at the farmers market or this festival or that. Leave it! The crappy "reusable" water bottle with the dentist's name all over it, a frisbee, a mini-flashlight, a comb, an antenna ball, earbuds that you just know will only work once. If we all stop mindlessly taking this stuff because it's free maybe they will stop making it.
• Reusable produce bags. Whether you shop at a large grocery store or a local farmers market these are great.
• Use the local library. If they don't have the book you want they will likely borrow the book from another library. I have found most libraries are part of a bigger library system.
  Lastly, I'll say start small. It's easy to read that list and get overwhelmed so maybe start by changing one habit and go from there. I'm confident once someone sees how easy it is more habits will change for the better.
  Thanks for writing this @sayee