Pick a room that you spend a lot of time in - your office, your kitchen, your living room.
Next, make a list of the objects in that room you touch on a usual basis. Pens, utensils, counter tops, phones, keyboards, couches, light switches, carpet, etc.
Make a note next to each object in your list with the material that object is made of. Is it plastic? Is it wood? If it's wood, is the wood covered in a poly finish?